Knowledge

Run-length encoding

Source đź“ť

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green green green green green green green green" is shortened to "green x 9". This is most efficient on data that contains many such runs, for example, simple graphic images such as icons, line drawings, games, and animations. For files that do not have many runs, encoding them with RLE could increase the file size.
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Run-length encoding can be expressed in multiple ways to accommodate data properties as well as additional compression algorithms. For instance, one popular method encodes run lengths for runs of two or more characters only, using an "escape" symbol to identify runs, or using the character itself as
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One other matter is the application of additional compression algorithms. Even with the runs extracted, the frequencies of different characters may be large, allowing for further compression; however, if the run lengths are written in the file in the locations where the runs occurred, the presence
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of data (consecutive occurrences of the same data value) are stored as a single occurrence of that data value and a count of its consecutive occurrences, rather than as the original run. As an imaginary example of the concept, when encoding an image built up from colored dots, the sequence "green
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of these numbers interrupts the normal flow and makes it harder to compress. To overcome this, some run-length encoders separate the data and escape symbols from the run lengths, so that the two can be handled independently. For the example data, this would result in two outputs, the string "
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def rle_encode(iterable, *, length_first=True): """ >>> "".join(rle_encode("AAAABBBCCDAA")) '4A3B2C1D2A' >>> "".join(rle_encode("AAAABBBCCDAA", length_first=False)) 'A4B3C2D1A2'
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Run-length encoding compresses data by reducing the physical size of a repeating string of characters. This process involves converting the input data into a compressed format by identifying and counting consecutive occurrences of each character. The steps are as follows:
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Lossy RLE: In this variation, some bits are intentionally discarded during compression (often by setting one or two significant bits of each pixel to 0). This leads to higher compression rates while minimally impacting the visual quality of the
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characters like this, the principle remains the same. Even binary data files can be compressed with this method; file format specifications often dictate repeated bytes in files as padding space. However, newer compression methods such as
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Sequential RLE: This method processes data one line at a time, scanning from left to right. It is commonly employed in image compression. Other variations of this technique include scanning the data vertically, diagonally, or in
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This can be interpreted as a sequence of twelve Ws, one B, twelve Ws, three Bs, etc., and represents the original 67 characters in only 18. While the actual format used for the storage of images is generally binary rather than
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This would be interpreted as a run of twelve Ws, a B, a run of twelve Ws, a run of three Bs, etc. In data where runs are less frequent, this can significantly improve the compression rate.
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Adaptive RLE: Uses different encoding schemes depending on the length of runs to optimize compression ratios. For example, short runs might use a different encoding format than long runs.
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The decoding process involves reconstructing the original data from the encoded format by repeating characters according to their counts. The steps are as follows:
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Run-length encoding (RLE) schemes were employed in the transmission of analog television signals as far back as 1967. In 1983, run-length encoding was
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With a run-length encoding (RLE) data compression algorithm applied to the above hypothetical scan line, it can be rendered as follows:
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the escape, so that any time a character appears twice it denotes a run. On the previous example, this would give the following:
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Consider a screen containing plain black text on a solid white background. There will be many long runs of white
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machines, known as T.45. That fax colour coding standard, which along with other techniques is incorporated into
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Robinson, A. H.; Cherry, C. (1967). "Results of a prototype television bandwidth compression scheme".
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in the blank space, and many short runs of black pixels within the text. A hypothetical
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smallest possible implementation (about 20 SLoC) in ANSI C. FOSS, compatible with
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for compressing black and white images, that was widely supplanted by their later
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RLE may also refer in particular to an early graphics file format supported by
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WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW
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Run-length encoding implemented in different programming languages
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Count the number of consecutive repeating characters (run length).
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For each count-character pair, repeat the character count times.
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uses it on the coefficients that remain after transforming and
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also describes a standard to encode run-length colour for
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before the advent of more sophisticated formats such as
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Recommendation T.45 (02/00): Run-length colour encoding
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RLE is particularly well suited to 851: 671:Comparison of graphics file formats 13: 3992:Comparison of audio coding formats 887: 14: 4054: 935: 16:Form of lossless data compression 2158: 2157: 2148: 2147: 4043:Lossless compression algorithms 188:is the size of the input data. 3554:ISO/IEC base media file format 817: 789: 767: 169: 163: 151:RLE has a space complexity of 1: 775:"Run Length Encoding Patents" 727: 217:Imports and helper functions 146: 7: 654: 636: 51:Graphics Interchange Format 10: 4059: 3997:Comparison of video codecs 2507:(GB/T 33475.2,GY/T 299.1) 2039:Compressed data structures 1361:RLE + BWT + MTF + Huffman 1029:Asymmetric numeral systems 555: 340:Traverse the encoded data. 18: 4010: 3984: 3829: 3803: 3657: 3634: 3606: 3583: 3518: 3509: 3424: 3305: 3294: 3086: 3038: 3015: 2987: 2929: 2891: 2806: 2705: 2694: 2522: 2491: 2442: 2404: 2352: 2235: 2224: 2143: 2127: 2111: 2029: 1954: 1886: 1877: 1800: 1734: 1725: 1626: 1543: 1534: 1450: 1398:Discrete cosine transform 1388: 1379: 1328:LZ77 + Huffman + context 1281: 1191: 1121: 1009: 1000: 681:Burrows–Wheeler transform 35:lossless data compression 2103:Smallest grammar problem 701:Forsyth–Edwards Notation 389: 359: 322: 220: 201:Traverse the input data. 68:History and applications 19:Not to be confused with 3821:Alliance for Open Media 2044:Compressed suffix array 1593:Nyquist–Shannon theorem 857:"Smile! You're on RLE!" 825:"Data recording method" 744:Proceedings of the IEEE 141:Modified Huffman coding 2741:MPEG-1 Layer III (MP3) 761:10.1109/PROC.1967.5493 437:'AAAABBBCCDAA' 431:'AAAABBBCCDAA' 176: 3759:QuickTime File Format 2073:Kolmogorov complexity 1941:Video characteristics 1318:LZ77 + Huffman + ANS 874:Transactor Publishing 666:Look-and-say sequence 616:WW12BWW12BB3WW24BWW14 351:Python implementation 212:Python implementation 177: 4018:Compression software 3575:MPEG media transport 2652:Sorenson Video/Spark 2163:Compression software 1757:Compression artifact 1713:Psychoacoustic model 175:{\displaystyle O(n)} 157: 4016:for techniques and 4014:Compression methods 2510:HDR Vivid(GY/T 358) 2153:Compression formats 1792:Texture compression 1787:Standard test image 1603:Silence compression 629:" and the numbers ( 583:12W1B12W3B24W1B14W 119:(by Apple, used in 27:Run-length encoding 2061:Information theory 1916:Display resolution 1742:Chroma subsampling 1131:Byte pair encoding 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August 2024. 913: 886: 865:The Transactor 844: 830:Google Patents 816: 802:Google Patents 788: 766: 732: 731: 729: 726: 725: 724: 719: 717:Huffman coding 714: 709: 704: 698: 693: 688: 683: 678: 673: 668: 663: 656: 653: 652: 651: 648: 644: 638: 635: 619: 618: 586: 585: 576: 575: 557: 554: 390: 360: 358: 355: 354: 352: 349: 348: 347: 344: 341: 333: 330: 323: 221: 219: 216: 215: 213: 210: 209: 208: 205: 202: 193: 190: 171: 168: 165: 162: 148: 145: 113:Truevision TGA 108:image blocks. 86:computer icons 69: 66: 15: 9: 6: 4: 3: 2: 4055: 4044: 4041: 4039: 4036: 4035: 4033: 4019: 4015: 4009: 4003: 4000: 3998: 3995: 3993: 3990: 3989: 3987: 3983: 3973: 3970: 3968: 3965: 3964: 3963: 3960: 3958: 3955: 3953: 3950: 3948: 3945: 3944: 3943: 3940: 3936: 3933: 3931: 3928: 3926: 3923: 3921: 3918: 3917: 3916: 3913: 3909: 3906: 3904: 3901: 3900: 3899: 3896: 3894: 3891: 3889: 3886: 3882: 3879: 3877: 3874: 3872: 3869: 3867: 3864: 3863: 3862: 3859: 3855: 3852: 3850: 3847: 3845: 3842: 3841: 3840: 3837: 3836: 3834: 3832: 3828: 3822: 3819: 3817: 3814: 3812: 3809: 3808: 3806: 3802: 3792: 3789: 3787: 3784: 3780: 3777: 3776: 3775: 3772: 3770: 3767: 3765: 3762: 3760: 3757: 3753: 3750: 3749: 3748: 3745: 3743: 3740: 3738: 3735: 3733: 3730: 3728: 3725: 3723: 3720: 3718: 3715: 3713: 3710: 3706: 3703: 3702: 3701: 3698: 3696: 3693: 3691: 3688: 3686: 3683: 3681: 3678: 3676: 3673: 3671: 3668: 3666: 3663: 3662: 3660: 3656: 3650: 3647: 3645: 3642: 3641: 3639: 3637: 3633: 3627: 3624: 3622: 3619: 3617: 3614: 3613: 3611: 3609: 3605: 3599: 3596: 3594: 3591: 3590: 3588: 3586: 3582: 3576: 3573: 3571: 3568: 3566: 3563: 3560: 3557: 3555: 3552: 3550: 3547: 3545: 3542: 3538: 3535: 3534: 3533: 3530: 3529: 3527: 3525: 3521: 3517: 3514: 3512: 3508: 3498: 3495: 3493: 3490: 3488: 3485: 3483: 3480: 3478: 3475: 3473: 3470: 3468: 3465: 3463: 3460: 3458: 3455: 3453: 3450: 3448: 3445: 3443: 3440: 3438: 3435: 3433: 3430: 3429: 3427: 3423: 3417: 3414: 3412: 3409: 3407: 3404: 3402: 3399: 3397: 3394: 3392: 3389: 3387: 3384: 3382: 3379: 3377: 3374: 3372: 3369: 3367: 3364: 3362: 3359: 3357: 3354: 3352: 3349: 3347: 3344: 3342: 3339: 3337: 3336:CCITT Group 4 3334: 3333: 3331: 3329: 3325: 3321: 3316: 3312: 3308: 3304: 3301: 3299: 3293: 3283: 3280: 3278: 3275: 3273: 3270: 3268: 3267:aptX Adaptive 3265: 3263: 3260: 3258: 3255: 3253: 3250: 3248: 3245: 3243: 3240: 3238: 3235: 3233: 3230: 3228: 3225: 3223: 3220: 3215: 3214: 3212: 3210: 3207: 3205: 3202: 3200: 3197: 3195: 3192: 3190: 3187: 3185: 3182: 3180: 3177: 3175: 3172: 3170: 3167: 3165: 3162: 3160: 3157: 3155: 3152: 3150: 3147: 3145: 3142: 3140: 3137: 3135: 3132: 3130: 3127: 3125: 3122: 3120: 3117: 3115: 3112: 3110: 3107: 3105: 3102: 3100: 3097: 3095: 3092: 3091: 3089: 3085: 3078: 3075: 3073: 3070: 3067: 3064: 3059: 3056: 3055: 3053: 3050: 3047: 3044: 3043: 3041: 3037: 3031: 3028: 3026: 3023: 3022: 3020: 3018: 3017:Bluetooth SIG 3014: 3008: 3005: 3003: 3000: 2998: 2995: 2994: 2992: 2990: 2986: 2980: 2977: 2975: 2972: 2970: 2967: 2965: 2962: 2960: 2957: 2955: 2952: 2950: 2947: 2945: 2942: 2940: 2937: 2936: 2934: 2932: 2928: 2922: 2919: 2917: 2914: 2912: 2909: 2907: 2904: 2902: 2899: 2898: 2896: 2894: 2890: 2884: 2881: 2879: 2876: 2874: 2871: 2869: 2866: 2864: 2861: 2859: 2856: 2854: 2851: 2849: 2846: 2844: 2841: 2839: 2836: 2834: 2831: 2827: 2824: 2822: 2819: 2818: 2817: 2814: 2813: 2811: 2809: 2805: 2799: 2796: 2794: 2791: 2789: 2786: 2784: 2781: 2779: 2776: 2774: 2771: 2769: 2766: 2764: 2763:MPEG Surround 2761: 2757: 2754: 2752: 2749: 2748: 2747: 2744: 2742: 2739: 2737: 2734: 2730: 2727: 2726: 2725: 2722: 2721: 2719: 2717: 2712: 2708: 2704: 2701: 2699: 2693: 2683: 2680: 2678: 2675: 2673: 2670: 2668: 2665: 2663: 2660: 2658: 2655: 2653: 2650: 2648: 2645: 2643: 2640: 2638: 2635: 2633: 2630: 2626: 2623: 2621: 2618: 2617: 2615: 2611: 2608: 2606: 2603: 2602: 2601: 2598: 2596: 2593: 2591: 2588: 2586: 2583: 2581: 2578: 2576: 2573: 2571: 2568: 2566: 2563: 2561: 2558: 2556: 2553: 2551: 2548: 2546: 2543: 2541: 2538: 2536: 2533: 2531: 2528: 2527: 2525: 2521: 2514: 2509: 2508: 2506: 2503: 2500: 2497: 2496: 2494: 2490: 2484: 2481: 2479: 2476: 2474: 2471: 2469: 2466: 2464: 2461: 2459: 2456: 2454: 2451: 2450: 2448: 2445: 2441: 2435: 2432: 2430: 2427: 2425: 2422: 2420: 2417: 2415: 2412: 2411: 2409: 2407: 2403: 2397: 2394: 2392: 2389: 2387: 2384: 2382: 2379: 2377: 2374: 2372: 2369: 2367: 2364: 2363: 2361: 2359: 2355: 2351: 2343: 2340: 2338: 2335: 2334: 2333: 2330: 2326: 2323: 2322: 2321: 2318: 2314: 2313:Part 2 / HEVC 2311: 2310: 2309: 2306: 2302: 2301:Part 33 / IVC 2299: 2297: 2296:Part 10 / AVC 2294: 2292: 2289: 2288: 2287: 2284: 2280: 2277: 2276: 2275: 2272: 2270: 2267: 2265: 2262: 2260: 2257: 2255: 2252: 2251: 2249: 2247: 2242: 2238: 2234: 2231: 2229: 2223: 2218: 2214: 2211: 2204: 2199: 2197: 2192: 2190: 2185: 2184: 2181: 2168: 2164: 2156: 2154: 2146: 2145: 2142: 2136: 2133: 2132: 2130: 2126: 2120: 2117: 2116: 2114: 2110: 2104: 2101: 2099: 2096: 2094: 2091: 2089: 2086: 2084: 2081: 2079: 2076: 2074: 2071: 2067: 2064: 2063: 2062: 2059: 2057: 2054: 2050: 2047: 2045: 2042: 2041: 2040: 2037: 2036: 2034: 2032: 2028: 2016: 2013: 2011: 2008: 2007: 2006: 2003: 1999: 1996: 1994: 1991: 1989: 1986: 1985: 1983: 1981: 1978: 1976: 1973: 1971: 1968: 1966: 1963: 1962: 1960: 1957: 1953: 1947: 1946:Video quality 1944: 1942: 1939: 1937: 1934: 1932: 1929: 1927: 1924: 1922: 1919: 1917: 1914: 1910: 1907: 1905: 1902: 1900: 1897: 1896: 1895: 1892: 1891: 1889: 1885: 1882: 1880: 1876: 1864: 1861: 1859: 1856: 1854: 1851: 1849: 1846: 1845: 1844: 1841: 1839: 1836: 1834: 1831: 1829: 1826: 1824: 1821: 1819: 1816: 1814: 1811: 1809: 1806: 1805: 1803: 1799: 1793: 1790: 1788: 1785: 1783: 1780: 1778: 1775: 1773: 1770: 1768: 1765: 1763: 1760: 1758: 1755: 1753: 1750: 1748: 1745: 1743: 1740: 1739: 1737: 1733: 1730: 1728: 1724: 1714: 1711: 1709: 1706: 1702: 1699: 1697: 1694: 1692: 1689: 1687: 1684: 1682: 1679: 1678: 1677: 1674: 1670: 1667: 1666: 1665: 1662: 1658: 1655: 1653: 1650: 1649: 1648: 1645: 1643: 1640: 1638: 1635: 1634: 1632: 1629: 1625: 1619: 1616: 1614: 1613:Speech coding 1611: 1609: 1608:Sound quality 1606: 1604: 1601: 1599: 1596: 1594: 1591: 1589: 1586: 1584: 1583:Dynamic range 1581: 1579: 1576: 1574: 1571: 1567: 1564: 1562: 1559: 1557: 1554: 1553: 1552: 1549: 1548: 1546: 1542: 1539: 1537: 1533: 1523: 1520: 1516: 1513: 1511: 1508: 1506: 1503: 1502: 1500: 1496: 1493: 1491: 1488: 1486: 1483: 1481: 1478: 1476: 1473: 1472: 1471: 1468: 1464: 1461: 1460: 1459: 1456: 1455: 1453: 1449: 1441: 1438: 1436: 1433: 1431: 1428: 1427: 1426: 1423: 1421: 1418: 1416: 1413: 1409: 1406: 1404: 1401: 1400: 1399: 1396: 1395: 1393: 1391: 1387: 1384: 1382: 1378: 1366: 1363: 1362: 1360: 1355: 1353: 1350: 1349: 1348:LZ77 + Range 1347: 1343: 1340: 1339: 1337: 1333: 1330: 1329: 1327: 1323: 1320: 1319: 1317: 1313: 1310: 1309: 1307: 1303: 1300: 1298: 1295: 1293: 1290: 1289: 1287: 1286: 1284: 1280: 1274: 1271: 1269: 1266: 1264: 1261: 1259: 1256: 1254: 1251: 1247: 1244: 1242: 1239: 1238: 1237: 1234: 1232: 1229: 1227: 1224: 1220: 1217: 1216: 1215: 1212: 1210: 1207: 1205: 1202: 1200: 1197: 1196: 1194: 1190: 1182: 1179: 1177: 1174: 1172: 1169: 1167: 1164: 1162: 1159: 1157: 1154: 1152: 1149: 1147: 1144: 1142: 1139: 1138: 1137: 1134: 1132: 1129: 1128: 1126: 1124: 1120: 1112: 1109: 1107: 1104: 1102: 1099: 1097: 1094: 1093: 1092: 1089: 1087: 1084: 1082: 1079: 1077: 1074: 1072: 1069: 1067: 1064: 1062: 1059: 1055: 1052: 1050: 1047: 1045: 1042: 1041: 1040: 1037: 1035: 1032: 1030: 1027: 1025: 1022: 1020: 1017: 1016: 1014: 1012: 1008: 1005: 1003: 999: 994: 987: 982: 980: 975: 973: 968: 967: 964: 957: 953: 950: 947: 943: 940: 939: 926: 920: 918: 902: 898: 897: 890: 875: 871: 867: 866: 858: 854: 848: 832: 831: 826: 820: 804: 803: 798: 792: 776: 770: 762: 758: 754: 750: 746: 745: 737: 733: 723: 720: 718: 715: 713: 710: 708: 705: 702: 699: 697: 694: 692: 689: 687: 684: 682: 679: 677: 676:Golomb coding 674: 672: 669: 667: 664: 662: 659: 658: 649: 645: 641: 640: 634: 631:12,12,3,24,14 622: 614: 613: 612: 608: 602: 598: 593: 581: 580: 579: 571: 570: 569: 567: 563: 553: 452:from_iterable 345: 342: 339: 338: 337: 329: 206: 203: 200: 199: 198: 189: 166: 160: 144: 142: 138: 134: 130: 126: 122: 118: 114: 109: 107: 103: 99: 95: 91: 87: 83: 79: 75: 65: 59: 54: 52: 48: 43: 40: 36: 32: 28: 22: 3068:(GB/T 22726) 2729:Multichannel 2585:MSU Lossless 2499:AVS1 P2/AVS+ 2453:TrueMotion S 2391:H.265 / HEVC 2337:Part 1 / EVC 2325:Part 3 / VVC 2291:Part 2 / ASP 2119:Hutter Prize 2083:Quantization 1988:Compensation 1837: 1782:Quantization 1505:Compensation 1272: 1071:Shannon–Fano 1011:Entropy type 946:Rosetta Code 905:. Retrieved 895: 889: 878:. Retrieved 869: 863: 847: 835:. Retrieved 828: 819: 807:. Retrieved 800: 791: 779:. Retrieved 769: 748: 742: 736: 696:Bitmap index 627:WWBWWBBWWBWW 623: 620: 609: 605:BWWBWWBWWBWW 587: 577: 559: 552: 485:length_first 413:length_first 335: 328: 195: 150: 110: 71: 55: 44: 38: 30: 26: 25: 3786:MOD and TOD 3727:Flash Video 3665:3GP and 3G2 3346:HEIC / HEIF 3298:compression 3058:Audio Vivid 2793:MPEG-D USAC 2788:MPEG-4 CELP 2783:MPEG-4 HVXC 2698:compression 2530:Apple Video 2446:and AOMedia 2396:H.266 / VVC 2386:H.264 / AVC 2228:compression 2213:compression 2078:Prefix code 1931:Frame types 1752:Color space 1578:Convolution 1308:LZ77 + ANS 1219:Incremental 1192:Other types 1111:Levenshtein 755:: 356–364. 712:Convolution 58:Windows 3.x 4032:Categories 4020:for codecs 3967:Daubechies 3942:Transforms 3844:Arithmetic 3511:Containers 3216:True Audio 3060:(GY/T 363) 2778:MPEG-4 DST 2773:MPEG-4 SLS 2768:MPEG-4 ALS 2642:SheerVideo 2616:QuickTime 2444:TrueMotion 2210:Multimedia 2135:Mark Adler 2093:Redundancy 2010:Daubechies 1993:Estimation 1926:Frame rate 1848:Daubechies 1808:Chain code 1767:Macroblock 1573:Companding 1510:Estimation 1430:Daubechies 1136:Lempel–Ziv 1096:Exp-Golomb 1024:Arithmetic 907:2015-12-06 880:2015-12-06 728:References 599:often use 395:rle_decode 106:quantizing 94:CompuServe 47:CompuServe 3769:RealMedia 3371:JPEG 2000 3174:RealAudio 3154:OptimFROG 2632:RealVideo 2620:Animation 2590:OMS Video 2217:container 2112:Community 1936:Interlace 1322:Zstandard 1101:Fibonacci 1091:Universal 1049:Canonical 566:scan line 365:itertools 226:itertools 147:Algorithm 37:in which 3888:Lossless 3854:Modified 3747:Matroska 3626:Matroska 3537:MPEG-PES 3149:Musepack 3046:AVS1 P10 2625:Graphics 2575:Lagarith 2098:Symmetry 2066:Timeline 2049:FM-index 1894:Bit rate 1887:Concepts 1735:Concepts 1598:Sampling 1551:Bit rate 1544:Concepts 1246:Sequitur 1081:Tunstall 1054:Modified 1044:Adaptive 1002:Lossless 855:(1987). 655:See also 637:Variants 536:iterable 401:iterable 313:iterable 289:compress 256:iterable 238:compress 184:, where 121:MacPaint 117:PackBits 92:such as 74:patented 3962:Wavelet 3903:DEFLATE 3849:Huffman 3839:Entropy 3831:Methods 3816:MPEG LA 3705:Smacker 3593:H.222.0 3549:MPEG-TS 3544:MPEG-PS 3532:MPEG-ES 3416:TIFF/IT 3411:TIFF/EP 3396:JPEG XT 3391:JPEG XS 3386:JPEG XR 3381:JPEG XL 3376:JPEG-LS 3257:aptX HD 3237:WavPack 3179:RTAudio 3119:Codec 2 3052:AVS2 P3 2979:GSM-EFR 2949:AMR-WB+ 2883:G.729.1 2863:G.723.1 2853:G.722.2 2848:G.722.1 2647:Smacker 2637:RTVideo 2565:Huffyuv 2545:Cinepak 2505:AVS2 P2 2219:formats 2056:Entropy 2005:Wavelet 1984:Motion 1843:Wavelet 1823:Fractal 1818:Deflate 1801:Methods 1588:Latency 1501:Motion 1425:Wavelet 1342:LHA/LZH 1292:Deflate 1241:Re-Pair 1236:Grammar 1066:Shannon 1039:Huffman 995:methods 876:: 16–18 837:14 July 809:14 July 781:14 July 707:DEFLATE 643:blocks. 597:DEFLATE 556:Example 530:batched 383:batched 356:Imports 244:groupby 182:⁠ 153:⁠ 131:. The 82:palette 78:Hitachi 53:(GIF). 3764:RatDVD 3658:Others 3425:Others 3227:VMR-WB 3222:TwinVQ 3087:Others 2974:GSM-FR 2969:GSM-HR 2959:EVRC-B 2944:AMR-WB 2916:Vorbis 2756:AAC-LD 2751:HE-AAC 2657:Theora 2600:ProRes 2595:Pixlet 2523:Others 2332:MPEG-5 2320:MPEG-I 2308:MPEG-H 2286:MPEG-4 2279:Part 2 2274:MPEG-2 2269:MPEG-1 2167:codecs 2128:People 2031:Theory 1998:Vector 1515:Vector 1332:Brotli 1282:Hybrid 1181:Snappy 1034:Golomb 903:. 2000 647:image. 562:pixels 491:repeat 458:repeat 443:return 377:repeat 368:import 295:repeat 280:return 271:333334 232:repeat 229:import 3985:Lists 3930:ADPCM 3925:µ-law 3920:A-law 3893:Lossy 3866:ACELP 3811:NETVC 3636:SMPTE 3598:T.802 3585:ITU-T 3561:(MP4) 3361:JBIG2 3324:ITU-T 3296:Image 3232:VSELP 3209:SVOPC 3199:Siren 3169:RCELP 3164:QCELP 3109:ATRAC 3094:ACELP 2911:Speex 2878:G.729 2873:G.728 2868:G.726 2858:G.723 2843:G.722 2838:G.719 2833:G.718 2826:µ-law 2821:A-law 2816:G.711 2808:ITU-T 2696:Audio 2570:Indeo 2550:Daala 2406:SMPTE 2381:H.263 2376:H.262 2371:H.261 2366:H.120 2354:ITU-T 2259:MJPEG 2226:Video 1958:parts 1956:Codec 1921:Frame 1879:Video 1863:SPIHT 1772:Pixel 1727:Image 1681:ACELP 1652:ADPCM 1642:ÎĽ-law 1637:A-law 1630:parts 1628:Codec 1536:Audio 1475:ACELP 1463:ADPCM 1440:SPIHT 1381:Lossy 1365:bzip2 1356:LZHAM 1312:LZFSE 1214:Delta 1106:Gamma 1086:Unary 1061:Range 872:(6). 860:(PDF) 751:(3). 592:ASCII 446:chain 371:chain 4012:See 3957:MDCT 3935:DPCM 3881:WLPC 3871:CELP 3774:RIFF 3752:WebM 3742:M2TS 3732:HEIF 3700:Bink 3680:AIFF 3608:IETF 3497:WebP 3492:WBMP 3487:QTVR 3467:ICER 3462:FLIF 3452:DjVu 3442:AVIF 3432:APNG 3406:TIFF 3366:JPEG 3356:JBIG 3351:HEVC 3328:JPEG 3315:IETF 3282:LLAC 3277:LHDC 3272:LDAC 3252:aptX 3213:TTA 3194:SILK 3134:MELP 3129:Lyra 3124:iSAC 3114:CELT 3104:Asao 3099:ALAC 3077:ExAC 3072:L2HC 3002:AC-4 2997:AC-3 2989:ETSI 2954:EVRC 2931:3GPP 2921:FLAC 2906:iLBC 2901:Opus 2893:IETF 2716:MPEG 2682:YULS 2662:Thor 2610:4444 2560:FFV1 2540:Bink 2434:VC-6 2429:VC-5 2424:VC-3 2419:VC-2 2414:VC-1 2358:VCEG 2246:MPEG 2215:and 1970:DPCM 1777:PSNR 1708:MDCT 1701:WLPC 1686:CELP 1647:DPCM 1495:WLPC 1480:CELP 1458:DPCM 1408:MDCT 1352:LZMA 1253:LDCT 1231:DPCM 1176:LZWL 1166:LZSS 1161:LZRW 1151:LZJB 944:(on 839:2019 811:2019 783:2019 753:IEEE 601:LZ77 488:else 419:True 362:from 250:ilen 223:from 129:ILBM 127:and 102:JPEG 39:runs 3972:DWT 3952:FFT 3947:DCT 3915:PCM 3908:LZW 3876:LSP 3861:LPC 3779:WAV 3737:IFF 3722:EVO 3712:BMP 3695:BPG 3685:AVI 3675:ASF 3670:AMV 3649:MXF 3644:GXF 3621:Ogg 3616:RTP 3524:IEC 3520:ISO 3482:QOI 3477:PGF 3472:MNG 3457:EXR 3447:BPG 3437:AV1 3401:PNG 3341:GIF 3320:W3C 3311:ISO 3307:IEC 3247:MQA 3242:WMA 3204:SMV 3189:SHN 3184:SD2 3159:OSQ 3144:MT9 3066:DRA 3030:LC3 3025:SBC 3007:DTS 2964:EVS 2939:AMR 2746:AAC 2711:IEC 2707:ISO 2677:XEB 2672:WMV 2605:422 2555:DVI 2535:AVS 2483:AV1 2478:VP9 2473:VP8 2468:VP7 2463:VP6 2458:VP3 2241:IEC 2237:ISO 2015:DWT 1965:DCT 1909:VBR 1904:CBR 1899:ABR 1858:EZW 1853:DWT 1838:RLE 1828:KLT 1813:DCT 1696:LSP 1691:LAR 1676:LPC 1669:FFT 1566:VBR 1561:CBR 1556:ABR 1490:LSP 1485:LAR 1470:LPC 1435:DWT 1420:FFT 1415:DST 1403:DCT 1302:LZS 1297:LZX 1273:RLE 1268:PPM 1263:PAQ 1258:MTF 1226:DMC 1204:CTW 1199:BWT 1171:LZW 1156:LZO 1146:LZ4 1141:842 757:doi 633:). 607:). 515:for 503:int 470:int 392:def 316:))) 307:zip 283:sum 247:def 137:fax 125:PCX 123:), 98:GIF 76:by 62:rle 31:RLE 4034:: 3898:LZ 3690:AU 3522:, 3326:, 3322:, 3317:, 3313:, 3309:, 2709:, 2667:Ut 2356:, 2254:DV 2243:, 2239:, 1833:LP 1664:FT 1657:DM 1209:CM 916:^ 899:. 868:. 862:. 827:. 799:. 749:55 747:. 527:in 512:)) 482:if 479:)) 422:): 304:), 259:): 115:, 2713:, 2202:e 2195:t 2188:v 2169:) 2165:( 985:e 978:t 971:v 948:) 910:. 883:. 870:7 841:. 813:. 785:. 763:. 759:: 548:) 545:) 542:2 539:, 533:( 524:b 521:, 518:a 509:b 506:( 500:, 497:a 494:( 476:a 473:( 467:, 464:b 461:( 455:( 449:. 416:= 410:, 407:* 404:, 398:( 380:, 374:, 310:( 301:1 298:( 292:( 286:( 253:( 241:, 235:, 186:n 170:) 167:n 164:( 161:O 29:( 23:.

Index

run-length limited
lossless data compression
CompuServe
Graphics Interchange Format
Windows 3.x
patented
Hitachi
palette
computer icons
online services
CompuServe
GIF
JPEG
quantizing
Truevision TGA
PackBits
MacPaint
PCX
ILBM
International Telecommunication Union
fax
Modified Huffman coding
pixels
scan line
ASCII
DEFLATE
LZ77
Kolakoski sequence
Look-and-say sequence
Comparison of graphics file formats

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