--- /dev/null
+use utf8;
++{
+codec => {
+ jpeg => {
+ name => '<abbr title="Joint Photographic Experts Group">JPEG</abbr>',
+ available => 1992,
+ },
+ gif => {
+ name => '<abbr title="Graphics Interchange Format">GIF</abbr>',
+ available => 1987,
+ },
+ png => {
+ name => '<abbr title="Portable Network Graphics">PNG</abbr>',
+ available => 1996,
+ },
+ jp2k => {
+ name => 'JPEG 2000',
+ available => 2000,
+ },
+ webp => {
+ name => 'WebP',
+ available => 2010,
+ },
+ heic => {
+ name => '<abbr title="High Efficiency Image Container (HEVC in HEIF)">HEIC</abbr>',
+ available => 2015,
+ },
+ avif => {
+ name => '<abbr title="AV1 Image File Format">AVIF</abbr>',
+ available => 2019,
+ },
+ jxl => {
+ name => 'JPEG XL',
+ available => 2021,
+ },
+ pnm => {
+ name => '<abbr title="Portable aNyMap">PNM</abbr>',
+ available => 1988,
+ },
+},
+feature => {
+ default => {
+ children => [qw( quality_photo quality_art speed limits features royalties overhead support )],
+ },
+ quality_photo => {
+ name => 'compression (photo)',
+ score => {
+ jpeg => 3,
+ pnm => 'n',
+ gif => 1,
+ png => 1,
+ jp2k => 4,
+ webp => 3,
+ heic => 5,
+ avif => 5,
+ jxl => 5,
+ },
+ children => [qw( quality_photo_1 quality_photo_2 quality_photo_3 quality_photo_ll )],
+ },
+ quality_photo_1 => {
+ parent => 'quality_photo',
+ name => 'thumbnails',
+ score => {
+ jpeg => 2,
+ pnm => 1,
+ gif => 1,
+ png => 1,
+ jp2k => 3,
+ webp => 4,
+ heic => 5,
+ avif => 5,
+ jxl => 3,
+ },
+ },
+ quality_photo_2 => {
+ parent => 'quality_photo',
+ name => 'medium fidelity',
+ score => {
+ jpeg => 3,
+ pnm => 1,
+ gif => 1,
+ png => 1,
+ jp2k => 4,
+ webp => 3,
+ heic => 4,
+ avif => 5,
+ jxl => 5,
+ },
+ },
+ quality_photo_3 => {
+ parent => 'quality_photo',
+ name => 'high fidelity',
+ score => {
+ jpeg => 3,
+ pnm => 1,
+ gif => 1,
+ png => 2,
+ jp2k => 4,
+ webp => 2,
+ heic => 3,
+ avif => 4,
+ jxl => 5,
+ },
+ },
+ quality_photo_ll => {
+ parent => 'quality_photo',
+ name => 'lossless',
+ score => {
+ jpeg => 1,
+ pnm => 1,
+ gif => 1,
+ png => 2,
+ jp2k => 4,
+ webp => 3,
+ heic => 3,
+ avif => 3,
+ jxl => 5,
+ },
+ },
+ quality_art => {
+ name => 'compression (other images)',
+ score => {
+ jpeg => 2,
+ pnm => 'n',
+ gif => 1,
+ png => 3,
+ jp2k => 2,
+ webp => 4,
+ heic => 3,
+ avif => 4.5,
+ jxl => 5,
+ },
+ children => [qw( quality_art_2 quality_art_ll quality_art_mixed )],
+ },
+ quality_art_2 => {
+ name => 'lossy non-photographic',
+ score => {
+ jpeg => 2,
+ pnm => 1,
+ gif => 2,
+ png => 3,
+ jp2k => 2,
+ webp => 4,
+ heic => 3,
+ avif => 5,
+ jxl => 5,
+ },
+ },
+ quality_art_ll => {
+ name => 'lossless non-photographic',
+ score => {
+ jpeg => 1,
+ pnm => 1,
+ gif => 1,
+ png => 4,
+ jp2k => 2,
+ webp => 5,
+ heic => 2,
+ avif => 3,
+ jxl => 5,
+ },
+ },
+ quality_art_mixed => {
+ name => 'mixed photo/nonphoto',
+ score => {
+ jpeg => 2,
+ pnm => 1,
+ gif => 1,
+ png => 2,
+ jp2k => 2,
+ webp => 3,
+ heic => 3,
+ avif => 5,
+ jxl => 5,
+ },
+ },
+ speed => {
+ score => {
+ jpeg => 5,
+ pnm => 5,
+ gif => 4,
+ png => 4,
+ jp2k => 3,
+ webp => 4,
+ heic => 3,
+ avif => 3,
+ jxl => 5,
+ },
+ children => [qw( speed_encode speed_decode speed_parallel )],
+ },
+ speed_encode => {
+ parent => 'speed',
+ name => 'single-core encode',
+ score => {
+ jpeg => 5,
+ pnm => 0,
+ gif => 3, # palette conversion
+ png => 3,
+ jp2k => 4,
+ webp => 4,
+ heic => 3,
+ avif => 2,
+ jxl => 5,
+ },
+ },
+ speed_decode => {
+ parent => 'speed',
+ name => 'single-core decode',
+ score => {
+ jpeg => 5,
+ pnm => 0,
+ gif => 5,
+ png => 5,
+ jp2k => 4,
+ webp => 5,
+ heic => 3,
+ avif => 3,
+ jxl => 5,
+ },
+ },
+ speed_parallel => {
+ parent => 'speed',
+ name => 'pararellizable',
+ score => {
+ jpeg => 2,
+ pnm => 0,
+ gif => 2,
+ png => 2,
+ jp2k => 4,
+ webp => 2,
+ heic => 4,
+ avif => 4,
+ jxl => 5,
+ },
+ },
+ limits => {
+ score => {
+ jpeg => 3,
+ pnm => 3,
+ gif => 2,
+ png => 4,
+ jp2k => 5,
+ webp => 2,
+ heic => 4,
+ avif => 4.5,
+ jxl => 5,
+ },
+ children => [qw( max_dimensions max_bitdepth color_444 hdr max_channels )],
+ },
+ max_dimensions => {
+ parent => 'limits',
+ name => 'maximum image dimensions',
+ score => {
+ jpeg => [3, '65k²'], # 2**16
+ pnm => [5, '∞'],
+ gif => [3, '65k²'], # 2**16
+ png => [4, '2G²'], # 2**31
+ jp2k => [4, '4G²'], # 2**32
+ webp => [1, '16k²'], # 2**14
+ heic => [2,'8k×4k+', 'tilable, only 512×512 on Apple'], # 8193x4320
+ avif => [3, '65k²+', 'tilable, 7680×4320 with Advanced profile'], # 2**16
+ jxl => [4, '1G²'], # 2**30
+ },
+ },
+ max_bitdepth => {
+ parent => 'limits',
+ name => 'precision (max. bit depth)',
+ score => {
+ jpeg => [2, 8],
+ pnm => [2, 8, 'unofficial PFM extension for 32-bit'],
+ gif => [1, 8, '256 colour palette per frame'],
+ png => [4, 16],
+ jp2k => [5, 38],
+ webp => [2, 8],
+ heic => [3, 10], #TODO 16?
+ avif => [3, 12, '8, 10, 12 bit'],
+ jxl => [5, 32, '24-bit integer or 32-bit float'],
+ },
+ },
+ color_444 => {
+ parent => 'limits',
+ name => 'chroma subsampling',
+ score => {
+ jpeg => ['y', undef, '4:2:0, 4:2:2, 4:4:4'],
+ pnm => [4, '✘'],
+ gif => [4, '✘'],
+ png => [4, '✘'],
+ jp2k => 'y',
+ webp => [1, '4:2:0'],
+ heic => [1, '4:2:0'],
+ avif => ['y', undef, '4:2:0, 4:2:2, 4:4:4'],
+ jxl => ['y', undef, 'for JPEG compatibility'],
+ },
+ },
+ hdr => {
+ parent => 'limits',
+ name => 'wide gamut/HDR',
+ score => {
+ jpeg => 'n',
+ pnm => 'n',
+ gif => 'n',
+ png => 'y',
+ jp2k => 'y',
+ webp => 'n',
+ heic => 'y',
+ avif => 'y',
+ jxl => 'y',
+ },
+ },
+ max_channels => {
+ parent => 'limits',
+ name => 'maximum number of channels',
+ score => {
+ jpeg => [3, 4, 'RGB or CMYK'],
+ pnm => [3, 3, 'RGB'],
+ gif => [3, 3, 'RGB palette'],
+ png => [3, 4, 'RGBA'],
+ jp2k => [5, 2**15],
+ webp => [3, 4, 'RGBA'],
+ heic => [3, 3, 'RGB, separate alpha and depth'],
+ avif => [3, 3, 'RGB, separate alpha and depth'],
+ jxl => [4, 4099, 'native XYB'],
+ },
+ },
+ features => {
+ score => {
+ jpeg => 2,
+ pnm => [2, undef, 'great for simplicity and ASCII storage'],
+ gif => 2,
+ png => 3,
+ jp2k => 4,
+ webp => 2,
+ heic => 4,
+ avif => 4,
+ jxl => 5,
+ },
+ children => [qw( animation progressive alpha depthmap overlays authoring reencode compat_jpeg )],
+ },
+ animation => {
+ parent => 'features',
+ name => 'supports animation',
+ score => {
+ jpeg => [2, 'MJPEG'],
+ pnm => 'n',
+ gif => 'y',
+ png => [4, 'APNG', 'later backwards-compatible extension'],
+ jp2k => [2, 'MJP2'],
+ webp => 'y',
+ heic => 'y',
+ avif => 'y',
+ jxl => 'y',
+ },
+ },
+ progressive => {
+ parent => 'features',
+ name => 'progressive decoding',
+ score => {
+ jpeg => 4,
+ pnm => 'n',
+ gif => 2,
+ png => 2,
+ jp2k => 5,
+ webp => 'n',
+ heic => 'n',
+ avif => 'n',
+ jxl => 5,
+ },
+ },
+ alpha => {
+ parent => 'features',
+ name => 'alpha transparency',
+ score => {
+ jpeg => 'n',
+ pnm => ['n', undef, 'PAM extension'],
+ gif => [3, '1 bit'],
+ png => 'y',
+ jp2k => 'y',
+ webp => 'y',
+ heic => 'y',
+ avif => 'y',
+ jxl => 'y',
+ },
+ },
+ depthmap => {
+ parent => 'features',
+ name => 'depth map',
+ score => {
+ jpeg => 'n',
+ pnm => 'n',
+ gif => 'n',
+ png => 'n',
+ jp2k => 'n',
+ webp => 'n',
+ heic => 'y',
+ avif => 'y',
+ jxl => 'y',
+ },
+ },
+ overlays => {
+ parent => 'features',
+ name => 'overlays (layers)',
+ score => {
+ jpeg => 'n',
+ pnm => 'n',
+ gif => 'y',
+ png => 'n',
+ jp2k => 'n',
+ webp => 'n',
+ heic => 'y',
+ avif => 'y',
+ jxl => 'y',
+ },
+ },
+ authoring => {
+ parent => 'features',
+ name => 'authoring workflow suitability',
+ score => {
+ jpeg => 2,
+ pnm => 2,
+ gif => 2,
+ png => 3,
+ jp2k => 3,
+ webp => 2,
+ heic => 2,
+ avif => 2,
+ jxl => 5,
+ },
+ },
+ reencode => {
+ parent => 'features',
+ name => 'generation loss resilience',
+ score => {
+ jpeg => 4,
+ pnm => 0,
+ png => 0,
+ gif => 0,
+ jp2k => 3,
+ webp => 2,
+ heic => 3,
+ avif => 3,
+ jxl => 4,
+ },
+ },
+ compat_jpeg => {
+ parent => 'features',
+ name => 'lossless JPEG recompression',
+ score => {
+ jpeg => 0,
+ pnm => 'n',
+ gif => 'n',
+ png => 'n',
+ jp2k => 'n',
+ webp => 'n',
+ heic => 'n',
+ avif => 'n',
+ jxl => 'y',
+ },
+ },
+ royalties => {
+ name => 'royalty-free',
+ score => {
+ jpeg => 5,
+ pnm => 5,
+ gif => [5, undef, 'patented before 2003'],
+ png => 5,
+ jp2k => [3, undef, 'ISO specification not freely available'],
+ webp => [4, undef, 'free format, low remaining risk of patent trolls'],
+ heic => ['n', undef, 'heavily patented'],
+ avif => [4, undef, 'free format, risk of patent trolls'],
+ jxl => [4, undef, 'free format, risk of patent trolls'],
+ },
+ children => [],
+ },
+ support => {
+ score => {
+ jpeg => 5,
+ pnm => [2, undef],
+ gif => 5,
+ png => 5,
+ jp2k => [2, undef, 'Apple only'],
+ webp => [4, undef, 'modern browsers'],
+ heic => [1, undef, 'stored by latest cameras, no browser support'],
+ avif => [3, undef, 'all modern browsers except Safari and Edge'],
+ jxl => [2, undef, 'upcoming in most browsers'],
+ },
+ },
+ overhead => {
+ name => 'container overhead (file size)',
+ score => {
+ png => [3, 67, 'upto 70 bytes for specific RGBA'],
+ jpeg => [2, 160, '159 bytes minimum for gray, 288 for specific colours'],
+ gif => [4, 35, '43 bytes for transparent'],
+ webp => [4, 34, 'black or transparent lossless; 44-92 bytes lossy'],
+ bpg => [4, 31, 'lossy 29-62 bytes, lossless 37-160'],
+ flif => [5, 14, 'black or transparent; 20 bytes for specific RGBA'],
+ pnm => [5, 8, 'monochrome text PBM; 12 bytes PPM; 69 bytes PAM'],
+ jxl => [5, 12, '512×256 black pixels'],
+ avif => [1, 282, 'container overhead; 457 bytes with alpha'],
+ jp2k => [2, 123, 'experimental results, likely not optimal'],
+ heic => [1, 386],
+ },
+ },
+},
+}
git.shiar.nl / sheet.git / blobdiff