From: Mischa POSLAWSKY <perl@shiar.org>
Date: Sun, 31 Oct 2021 00:59:03 +0000 (+0200)
Subject: codec: netpbm (pnm) format for completeness
X-Git-Tag: v1.13~110
X-Git-Url: http://git.shiar.net/sheet.git/commitdiff_plain/8f768b6ed17048f182cde20a621758cdbd3b72bb

codec: netpbm (pnm) format for completeness

Does not compress, but significant for legacy Unix compatibility
and good as lossless baseline.
---

diff --git a/codec.inc.pl b/codec.inc.pl
index f4d90e3..92e17d5 100644
--- a/codec.inc.pl
+++ b/codec.inc.pl
@@ -33,6 +33,10 @@ codec => {
 		name => 'JPEG XL',
 		available => 2021,
 	},
+	pnm => {
+		name => '<abbr title="Portable aNyMap">PNM</abbr>',
+		available => 1988,
+	},
 },
 feature => {
 	default => {
@@ -42,6 +46,7 @@ feature => {
 		name => 'compression (photo)',
 		score => {
 			jpeg => 3,
+			pnm  => 'n',
 			gif  => 1,
 			png  => 1,
 			jp2k => 4,
@@ -57,6 +62,7 @@ feature => {
 		name => 'thumbnails',
 		score => {
 			jpeg => 2,
+			pnm  => 1,
 			gif  => 1,
 			png  => 1,
 			jp2k => 3,
@@ -71,6 +77,7 @@ feature => {
 		name => 'medium fidelity',
 		score => {
 			jpeg => 3,
+			pnm  => 1,
 			gif  => 1,
 			png  => 1,
 			jp2k => 4,
@@ -85,6 +92,7 @@ feature => {
 		name => 'high fidelity',
 		score => {
 			jpeg => 3,
+			pnm  => 1,
 			gif  => 1,
 			png  => 2,
 			jp2k => 4,
@@ -99,6 +107,7 @@ feature => {
 		name => 'lossless',
 		score => {
 			jpeg => 1,
+			pnm  => 1,
 			gif  => 1,
 			png  => 2,
 			jp2k => 4,
@@ -112,6 +121,7 @@ feature => {
 		name => 'compression (other images)',
 		score => {
 			jpeg => 2,
+			pnm  => 'n',
 			gif  => 1,
 			png  => 3,
 			jp2k => 2,
@@ -126,6 +136,7 @@ feature => {
 		name => 'lossy non-photographic',
 		score => {
 			jpeg => 2,
+			pnm  => 1,
 			gif  => 2,
 			png  => 3,
 			jp2k => 2,
@@ -139,6 +150,7 @@ feature => {
 		name => 'lossless non-photographic',
 		score => {
 			jpeg => 1,
+			pnm  => 1,
 			gif  => 1,
 			png  => 4,
 			jp2k => 2,
@@ -152,6 +164,7 @@ feature => {
 		name => 'mixed photo/nonphoto',
 		score => {
 			jpeg => 2,
+			pnm  => 1,
 			gif  => 1,
 			png  => 2,
 			jp2k => 2,
@@ -164,6 +177,7 @@ feature => {
 	speed => {
 		score => {
 			jpeg => 5,
+			pnm  => 5,
 			gif  => 4,
 			png  => 4,
 			jp2k => 3,
@@ -179,6 +193,7 @@ feature => {
 		name => 'single-core encode',
 		score => {
 			jpeg => 5,
+			pnm  => 0,
 			gif  => 3, # palette conversion
 			png  => 3,
 			jp2k => 4,
@@ -193,6 +208,7 @@ feature => {
 		name => 'single-core decode',
 		score => {
 			jpeg => 5,
+			pnm  => 0,
 			gif  => 5,
 			png  => 5,
 			jp2k => 4,
@@ -207,6 +223,7 @@ feature => {
 		name => 'pararellizable',
 		score => {
 			jpeg => 2,
+			pnm  => 0,
 			gif  => 2,
 			png  => 2,
 			jp2k => 4,
@@ -219,6 +236,7 @@ feature => {
 	limits => {
 		score => {
 			jpeg => 3,
+			pnm  => 3,
 			gif  => 2,
 			png  => 4,
 			jp2k => 5,
@@ -234,9 +252,10 @@ feature => {
 		name => 'maximum image dimensions',
 		score => {
 			jpeg => [3, '65k²'],   # 2**16
+			pnm  => [5,    '∞'],
 			gif  => [3, '65k²'],   # 2**16
 			png  => [4,  '2G²'],   # 2**31
-			jp2k => [5,  '4G²'],   # 2**32
+			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
@@ -248,6 +267,7 @@ feature => {
 		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],
@@ -262,6 +282,7 @@ feature => {
 		name => 'chroma subsampling',
 		score => {
 			jpeg => ['y', undef, '4:2:0, 4:2:2, 4:4:4'],
+			pnm  => [4, '✘'],
 			gif  => [4, '✘'],
 			png  => [4, '✘'],
 			jp2k => 'y',
@@ -276,6 +297,7 @@ feature => {
 		name => 'wide gamut/HDR',
 		score => {
 			jpeg => 'n',
+			pnm  => 'n',
 			gif  => 'n',
 			png  => 'y',
 			jp2k => 'y',
@@ -290,6 +312,7 @@ feature => {
 		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],
@@ -302,6 +325,7 @@ feature => {
 	features => {
 		score => {
 			jpeg => 2,
+			pnm  => [2, undef, 'great for simplicity and ASCII storage'],
 			gif  => 2,
 			png  => 3,
 			jp2k => 4,
@@ -317,6 +341,7 @@ feature => {
 		name => 'supports animation',
 		score => {
 			jpeg => [2, 'MJPEG'],
+			pnm  => 'n',
 			gif  => 'y',
 			png  => [4, 'APNG', 'later backwards-compatible extension'],
 			jp2k => [2, 'MJP2'],
@@ -331,6 +356,7 @@ feature => {
 		name => 'progressive decoding',
 		score => {
 			jpeg => 4,
+			pnm  => 'n',
 			gif  => 2,
 			png  => 2,
 			jp2k => 5,
@@ -345,6 +371,7 @@ feature => {
 		name => 'alpha transparency',
 		score => {
 			jpeg => 'n',
+			pnm  => ['n', undef, 'PAM extension'],
 			gif  => [3, '1 bit'],
 			png  => 'y',
 			jp2k => 'y',
@@ -359,6 +386,7 @@ feature => {
 		name => 'depth map',
 		score => {
 			jpeg => 'n',
+			pnm  => 'n',
 			gif  => 'n',
 			png  => 'n',
 			jp2k => 'n',
@@ -373,6 +401,7 @@ feature => {
 		name => 'overlays (layers)',
 		score => {
 			jpeg => 'n',
+			pnm  => 'n',
 			gif  => 'y',
 			png  => 'n',
 			jp2k => 'n',
@@ -387,6 +416,7 @@ feature => {
 		name => 'authoring workflow suitability',
 		score => {
 			jpeg => 2,
+			pnm  => 2,
 			gif  => 2,
 			png  => 3,
 			jp2k => 3,
@@ -401,6 +431,7 @@ feature => {
 		name => 'generation loss resilience',
 		score => {
 			jpeg => 4,
+			pnm  => 0,
 			png  => 0,
 			gif  => 0,
 			jp2k => 3,
@@ -415,6 +446,7 @@ feature => {
 		name => 'lossless JPEG recompression',
 		score => {
 			jpeg => 0,
+			pnm  => 'n',
 			gif  => 'n',
 			png  => 'n',
 			jp2k => 'n',
@@ -428,6 +460,7 @@ feature => {
 		name => 'royalty-free',
 		score => {
 			jpeg => 5,
+			pnm  => 5,
 			gif  => [5, undef, 'patented before 2003'],
 			png  => 5,
 			jp2k => [3, undef, 'ISO specification not freely available'],
@@ -441,6 +474,7 @@ feature => {
 	support => {
 		score => {
 			jpeg => 5,
+			pnm  => [2, undef],
 			gif  => 5,
 			png  => 5,
 			jp2k => [2, undef, 'Apple only'],