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pngã«é–¢ã™ã‚‹nilabã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (30)

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nilab 2012/10/07
pngcrushã§PNGãƒ•ã‚¡ã‚¤ãƒ«ã‹ã‚‰ä¸å¿…è¦ã¨æ€ã‚ã‚Œã‚‹ãƒ¡ã‚¿ãƒ‡ãƒ¼ã‚¿ã‚’å‰Šé™¤ - Weblog - hail2u.net

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Crazy*Planet:ãŠçµµæãç ”ç©¶å®¤ï¼šPNG(åŽŸç†ç·¨)
æ–°ã—ã„ç”»åƒãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã§ã‚ã‚‹ PNG ã«ã¤ã„ã¦ã€ä¸»ã«å¯¾æŠ—é¦¬ã§ã‚ã‚‹ GIF ã¨æ¯”è¼ƒã—ãªãŒã‚‰è§£èª¬ã—ã¦ã„ã¾ã™ã€‚ 1. ã¯ã˜ã‚ã« GIF ã¯ 2000 å¹´ 3 æœˆç¾åœ¨ã‚¤ãƒ³ã‚¿ãƒ¼ãƒãƒƒãƒˆä¸Šã§åºƒãä½¿ã‚ã‚Œã¦ã„ã‚‹ç”»åƒãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã§ã™ãŒã€ã€ŒãŠé‡‘ã‚’æ‰•ã‚ãªã‘ã‚Œã°ä½¿ãˆãªã„ï¼Ÿã€ã¨ã„ã†æ€ªæƒ…å ±ãŒé£›ã³äº¤ã£ã¦ã„ã¾ã™ã€‚ä¸€æ–¹ GIF ã®ä»£æ›¿å“ã¨ã—ã¦ PNG ã¨ã„ã†ç”»åƒãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆãŒã‚ã‚‹ã‚‰ã—ã„ã®ã§ã™ãŒã€æ©Ÿèƒ½ãŒåˆ¶é™ã•ã‚Œã‚‹ï¼Ÿã¨ã‹åœ§ç¸®çŽ‡ãŒæ‚ªããªã‚‹ï¼Ÿã¨ã„ã£ãŸç–‘å•ãŒé£›ã³äº¤ã£ã¦ã„ã¾ã™ã€‚ã“ã“ã§ã¯ä¸¡è€…ã«ã¤ã„ã¦æ¯”è¼ƒã—ãªãŒã‚‰ãã‚Œãžã‚Œã®åˆ©ç‚¹ãƒ»æ¬ ç‚¹ã‚’æ˜Žã‚‰ã‹ã«ã—ã¦ã‚†ããŸã„ã¨æ€ã„ã¾ã™ã€‚ 2. GIF ã«ã¤ã„ã¦ GIF ã¯ Graphic Interchange File ã®ç•¥ã§ã€1987 å¹´ã«å¤§æ‰‹ã‚¢ãƒ¡ãƒªã‚«ã®ãƒ‘ã‚½ã‚³ãƒ³é€šä¿¡ãƒãƒƒãƒˆ CompuServe ã®æ¨™æº–ç”»åƒãƒ•ã‚©ãƒ¼ãƒžãƒƒãƒˆã¨ã—ã¦é–‹ç™ºã•ã‚ŒãŸã‚‚ã®ã§ã™ã€‚1bit(2 è‰²), 4bit(16 è‰²), 8b
nilab 2012/05/06
Crazy*Planet:ãŠçµµæãç ”ç©¶å®¤ï¼šPNG(åŽŸç†ç·¨)

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PNG (Portable Network Graphics) Specification
PNG (Porta ble Network Graphics) Specification, Version 1.2 For list of authors, see Credits. ã“ã®æ–‡æ›¸ã®çŠ¶æ…‹ ã“ã‚Œã¯ RFC-2083 ã¨ã—ã¦ç™ºè¡¨ã•ã‚Œã€W3C å‹§å‘Šã§ã‚ã‚‹ PNG 1.0 ä»•æ§˜æ›¸ã®æ”¹è¨‚ç‰ˆã§ã™ã€‚æ”¹è¨‚ã¯ PNG é–‹ç™ºã‚°ãƒ«ãƒ¼ãƒ—ã«ã‚ˆã£ã¦å…¬é–‹ã•ã‚Œã¾ã—ãŸãŒã€æ¨™æº–åŒ–å›£ä½“ã«èªå¯ã•ã‚Œã¦ã„ã¾ã›ã‚“ã€‚ PNG ä»•æ§˜æ›¸ã¯ ISO/IEC JTC 1 SC 24 ã®æ¡é …ä¸‹ã§æ¨™æº–åŒ–ä¸ã§ã‚ã‚Šã€æœ€çµ‚çš„ã« ISO/IEC International Standard 15948 ã¨ã—ã¦å…¬é–‹ã•ã‚Œã‚‹ã“ã¨ãŒæœŸå¾…ã•ã‚Œã¦ã„ã¾ã™ã€‚ã“ã®ä»•æ§˜æ›¸ã®ä¸‹ä½äº’æ›æ€§ã‚’ç¶æŒã™ã‚‹ã“ã¨ãŒæ¨™æº–åŒ–å›£ä½“ã®æ„å›³ã§ã™ã€‚é–‹ç™ºè€…ã¯ç¾åœ¨ã® PNG ã®æ–‡æ›¸ã®çŠ¶æ…‹ã‚’å®šæœŸçš„ã« PNG ã®ã‚ªãƒ³ãƒ©ã‚¤ãƒ³ãƒªã‚½ãƒ¼ã‚¹ï¼ˆOnline Resources ã‚’å‚ç…§ã—ã¦ãã ã•ã„ï¼‰ã§ãƒã‚§ãƒƒã‚¯ã™
nilab 2012/05/06
PNG (Portable Network Graphics) Specification

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spec
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Portable Network Graphics - Wikipedia
ç”»åƒã®è‰²ãƒ¢ãƒ‡ãƒ«ï¼ˆè‹±èªžç‰ˆï¼‰ã¨ã—ã¦ã€æœ€å¤§16ãƒ“ãƒƒãƒˆã®ã‚°ãƒ¬ãƒ¼ã‚¹ã‚±ãƒ¼ãƒ«ã€24ãƒ“ãƒƒãƒˆã¨ 48ãƒ“ãƒƒãƒˆã®RGBã€ã¾ãŸã¯8ãƒ“ãƒƒãƒˆã¾ã§ã®ã‚¤ãƒ³ãƒ‡ãƒƒã‚¯ã‚¹ã‚«ãƒ©ãƒ¼ãƒ¢ãƒ¼ãƒ‰ï¼ˆãƒ‘ãƒ¬ãƒƒãƒˆã‚«ãƒ©ãƒ¼) ã‚’åˆ©ç”¨ã™ã‚‹ã“ã¨ãŒã§ãã‚‹[2][3][4]ã€‚é€éŽã«ã¤ã„ã¦ã¯ã‚¯ãƒãƒžã‚ãƒ¼ã«ã‚ˆã‚‹é€éŽæŒ‡å®šã€ãŠã‚ˆã³8ãƒ“ãƒƒãƒˆã‹ã‚‰16ãƒ“ãƒƒãƒˆã®ã‚¢ãƒ«ãƒ•ã‚¡ãƒãƒ£ãƒ³ãƒãƒ«ã‚’ã‚µãƒãƒ¼ãƒˆã™ã‚‹[5]ã€‚ã¾ãŸã€ç”»åƒã«ä»˜å±žã™ã‚‹ãƒ†ã‚ã‚¹ãƒˆãªã©ã®ãƒ¡ã‚¿ãƒ‡ãƒ¼ã‚¿ã‚„ã‚¬ãƒ³ãƒžå€¤ãªã©ã‚‚ç”»åƒã”ã¨ã«è¨˜éŒ²ã§ãã‚‹[1]ã€‚ æœ€åˆæœŸã®PNGã«ã¯GIFã‚¢ãƒ‹ãƒ¡ãƒ¼ã‚·ãƒ§ãƒ³ã«ç›¸å½“ã™ã‚‹æ©Ÿèƒ½ã¯ãªã‹ã£ãŸãŒã€2004å¹´ã‚ˆã‚Šã‚¢ãƒ‹ãƒ¡ãƒ¼ãƒ†ãƒƒãƒ‰PNG (APNG) ãŒæ‹¡å¼µä»•æ§˜ã¨ã—ã¦é–‹ç™ºã•ã‚Œã€ã‚¢ãƒ‹ãƒ¡ãƒ¼ã‚·ãƒ§ãƒ³ãŒå¯èƒ½ã«ãªã£ãŸã€‚APNGã¯2020å¹´ã”ã‚ä¸»ãªWebãƒ–ãƒ©ã‚¦ã‚¶å…¨ã¦ã®å¯¾å¿œãŒå®Œäº†ã—ã€åºƒãä½¿ç”¨å¯èƒ½ã«ãªã£ãŸã€‚2025å¹´ã«ã¯APNGã¯æ£å¼ã«PNGä»•æ§˜ã®ä¸€éƒ¨ã¨ãªã£ãŸã€‚ PNGãŒé–‹ç™ºã•ã‚ŒãŸå‹•æ©Ÿã¯ã€1994å¹´æœ«ã«ã€GIFã«ä½¿ã‚ã‚Œã¦ã„ãŸåœ§ç¸®ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ LZ
nilab 2012/05/06
Portable Network Graphics - Wikipedia

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Koders Code Search: cairo-png.c - C
nilab 2012/04/24
Koders Code Search: cairo-png.c - C : cairo_image_surface_create_from_png_stream

cairo

png
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[ãƒ…]Javaã§é€éŽåº¦(ã‚¢ãƒ«ãƒ•ã‚¡å€¤)ã®ã‚ã‚‹PNGãƒ•ã‚¡ã‚¤ãƒ«ã‚’å‡ºåŠ›ã™ã‚‹ (2012-02-10)
BufferedImage#setRGB ã§ä½œã£ã¦ã¿ã‚‹ã€‚ import java.awt.*; import java.awt.image.*; import java.io.*; import javax.imageio.*; public class AlphaPNG { public static void main(String[] args) throws Exception { int width = 256; int height = 256; Color[] colors = new Color[] { new Color(255, 0, 0), new Color(0, 255, 0), new Color(0, 0, 255), }; BufferedImage image = new BufferedImage(width, height, BufferedImage
nilab 2012/02/11
_[ãƒ…] Javaã§é€éŽåº¦(ã‚¢ãƒ«ãƒ•ã‚¡å€¤)ã®ã‚ã‚‹PNGãƒ•ã‚¡ã‚¤ãƒ«ã‚’å‡ºåŠ›ã™ã‚‹

java

alpha_channel

alpha_compositing

png
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[ãƒ…]cairoã§PNGç”»åƒã‚’æ‹¡å¤§ã™ã‚‹ (2012-01-26)
nilab 2012/01/26
_[ãƒ…] cairoã§PNGç”»åƒã‚’æ‹¡å¤§ã™ã‚‹

cairo

png
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32bitPNGã«ã¤ã„ã¦
nilab 2012/01/06
32bitPNGã«ã¤ã„ã¦ : ã‚¢ãƒ«ãƒ•ã‚¡ãƒãƒ£ãƒ³ãƒãƒ«ä»˜ãPNG : ã€ŒPNGã®ï¼‘ãƒ”ã‚¯ã‚»ãƒ«å†…ã®ãƒ‡ãƒ¼ã‚¿ã®ä¸¦ã³ã¯RGBAã®é †ã‚‰ã—ã„ã€‚BMPã¯BGRAã§ã‚ã‚‹ã€

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Google Code Archive - Long-term storage for Google Code Project Hosting.
nilab 2011/12/28
ppm2png.c - simple-png - spng, simple-png image utiliteis - Google Project Hosting

ppm

png

c
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png++, a C++ wrapper for libpng
nilab 2011/12/22
png++, a C++ wrapper for libpng

png

libpng

c++

lib
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C/C++ã§ã‚‚ã£ã¨ã‚‚ç°¡å˜ã«PNG/JPEG/BMP/ãã®ä»–ã®ç”»åƒã‚’read/writeã™ã‚‹ã«ã¯ï¼Ÿ - tuedaã®æ—¥è¨˜
ä¾‹ãˆã°PNGç”»åƒãªã‚‰libpngã‚’ä½¿ã†ã®ãŒã‚¹ã‚¿ãƒ³ãƒ€ãƒ¼ãƒ‰ãªã‚„ã‚Šæ–¹ã ãŒã€ã“ã®libpngãƒ©ã‚¤ãƒ–ãƒ©ãƒªå®Ÿã¯ã‹ãªã‚Šä½¿ã„ãšã‚‰ã„ã€‚ ã—ã‹ã‚‚libpngãŒæœ€åˆã‹ã‚‰ç”¨æ„ã•ã‚Œã¦ã„ã‚‹ç’°å¢ƒãªã‚‰ã¨ã‚‚ã‹ãã€è‡ªåˆ†ã§ã‚½ãƒ¼ã‚¹ã‚’å–ã£ã¦ãã¦ã‚³ãƒ³ãƒ‘ã‚¤ãƒ«ã—ã¦ä½¿ãˆã‚‹ã‚ˆã†ã«ã™ã‚‹ã®ã¯çµæ§‹å¤§å¤‰ãªã“ã¨ãŒå¤šã„ã€‚ å“è³ªãƒ»é€Ÿåº¦ã¯ã©ã†ã§ã‚‚ã„ã„ã‹ã‚‰ã¨ã«ã‹ãread/writeã ã‘æ‰‹è»½ã«ã—ãŸã„æ™‚ã«ã¯ã“ã‚Œã‚‰ã‚’ä½¿ã†ã®ã¯ã„ã„é¸æŠžè‚¢ã§ã¯ãªã„ã€‚ ãã“ã§Sean Barrettã•ã‚“ã®ï¼‘ãƒ•ã‚¡ã‚¤ãƒ«ã§PNGã‚‚JPEGã‚‚BMPã‚‚ãã®ä»–ã„ã‚ã„ã‚èªã‚ã¦ã—ã¾ã†å¤¢ã®ãƒ©ã‚¤ãƒ–ãƒ©ãƒªãŒå½¹ã«ç«‹ã¤ã€‚ ï¼ˆï¼‘ãƒ•ã‚¡ã‚¤ãƒ«ã¨è¨€ã£ã¦ã‚‚ï¼”ï¼•ï¼ï¼è¡Œã‚‚ã‚ã‚‹ã‘ã©ï¼‰ ä¸Šè¨˜HPã®ã€ public domain JPEG decompression public domain PNG decompression public domain BMP, TGA, PSD loading public domain ZLI
nilab 2011/12/22
C/C++ã§ã‚‚ã£ã¨ã‚‚ç°¡å˜ã«PNG/JPEG/BMP/ãã®ä»–ã®ç”»åƒã‚’read/writeã™ã‚‹ã«ã¯ï¼Ÿ - tuedaã®æ—¥è¨˜ : stbi-1.33 - public domain JPEG/PNG reader

c

lib

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jpeg
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GitHub - nothings/stb: stb single-file public domain libraries for C/C++
nilab 2011/12/22
stbi-1.33 - public domain JPEG/PNG reader

c

lib

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jpeg
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Ubuntu Manpage: pnginfo - display information on the PNG files named
nilab 2011/10/19
Ubuntu Manpage: pnginfo - display information on the PNG files named

png

tool
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PngUtils
PngUtils for Windows Png: utilities for PNG images Version 1.2.5 Description PngUtils is a collection of utilities for PNG images: Bmp2Png: convert between bit map images and PNG images Gif2Png: convert GIF to PNG OptiPng: optimize PNG images Png2Bmp: convert between bit map images and PNG images Png2Ico: convert PNG image to MS-Windows icon PngCheck: verify PNG image and show chunks PngChunkDesc: d
nilab 2011/10/19
PngUtils : "PngUtils is a collection of utilities for PNG images"

png

windows

tool
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PNG åˆ©ç”¨è¡“
ç›®æ¬¡ ã“ã®ãƒšãƒ¼ã‚¸ã«ã¤ã„ã¦ PNGã¨ã¯ï¼Ÿ PNGã®ç‰¹å¾´ï¼ˆç®‡æ¡æ›¸ãï¼‰ Webãƒšãƒ¼ã‚¸ã§PNGã®ç‰¹å¾´ã‚’æ´»ã‹ã™ï¼ï¼ˆã¾ã æ´»ã‹ã›ã¦ã„ãªã„ã‘ã©ï¼‰ ã‚¬ãƒ³ãƒž ã‚¬ãƒ³ãƒžã¨ã¯ï¼Ÿ ã‚¬ãƒ³ãƒžã®ç¨®é¡ž PNGãƒ„ãƒ¼ãƒ« pngcheck......PNGãƒ•ã‚¡ã‚¤ãƒ«ã®ãƒã‚§ãƒƒã‚¯ tiff2png......TIFFãƒ•ã‚¡ã‚¤ãƒ«ã‚’PNGå½¢å¼ã«å¤‰æ› PNGãƒ—ãƒã‚°ãƒ©ãƒŸãƒ³ã‚° æ›¸ãè¾¼ã¿ èªã¿è¾¼ã¿ ç”¨èªžè§£èª¬ å‚è€ƒã‚µã‚¤ãƒˆ Appendix A: Cygwinï¼ˆGNU-Win32)ç’°å¢ƒ Cygwinã¨ã¯ï¼Ÿ ã‚¤ãƒ³ã‚¹ãƒˆãƒ¼ãƒ« zlibã®ãƒ“ãƒ«ãƒ‰ libpngã®ãƒ“ãƒ«ãƒ‰ libtiffã®ãƒ“ãƒ«ãƒ‰ tiff2pngã®ãƒ“ãƒ«ãƒ‰ Appendix B: MS Visual C++ç’°å¢ƒ zlibã®ãƒ“ãƒ«ãƒ‰ zlib.dll libpngã®ãƒ“ãƒ«ãƒ‰ ã“ã®ãƒšãƒ¼ã‚¸ã«ã¤ã„ã¦ ã“ã®ãƒšãƒ¼ã‚¸ã¯ï¼Œç”»åƒå½¢å¼ã®ä¸€ã¤ã§ã‚ã‚‹PNGã‚’Webãƒšãƒ¼ã‚¸ã‚„ãƒ—ãƒã‚°ãƒ©ãƒ ã«åˆ©ç”¨ã™ã¹ãæ ¼é—˜ã™ã‚‹ãƒšãƒ¼ã‚¸ã§ã™ï¼Žå¾ã€…ã«æ›´æ–°ã—ã¦è¡Œã
nilab 2011/08/09
PNG åˆ©ç”¨è¡“

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libpng
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i-revo ãŠå®¢æ§˜ã‚µãƒãƒ¼ãƒˆ é‡è¦ãªãŠçŸ¥ã‚‰ã›
nilab 2011/08/02
png_set_write_fn ã§é–¢æ•°ã‚’ã‚»ãƒƒãƒˆã—ã¦ã€PNGãƒ‡ãƒ¼ã‚¿ãƒãƒƒãƒ•ã‚¡ãŒè¶³ã‚Šãªããªã£ãŸã‚‰ realloc ã—ã¦é ˜åŸŸã‚’æ‹¡å¼µã€‚ / libpng ã§ (ãƒ•ã‚¡ã‚¤ãƒ«ã‚’ä»‹ã•ãš) PNG ãƒ‡ãƒ¼ã‚¿ã‚’ç”Ÿæˆã™ã‚‹

png

libpng
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PNG Specification: Rationale
nilab 2011/02/18
PNG Specification: Rationale : 12.8. Non-premultiplied alpha : PNG uses "unassociated" or "non-premultiplied" alpha so that images with separate transparency masks can be stored losslessly. Another common technique, "premultiplied alpha", stores pixel values premultiplied by the alpha fraction; in e

png

alpha_channel
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Portable Network Graphics (PNG) Specification (Second Edition)
Porta ble Network Graphics (PNG) Specification (Second Edition) Information techno logy â€” Computer graphics and image processing â€” Porta ble Network Graphics (PNG): Functional specification. ISO/IEC 15948:2003 (E) W3C Recommendation 10 November 2003 This version: http://www.w3.org/TR/2003/REC-PNG-20031110 Latest version: http://www.w3.org/TR/PNG Previous version: http://www.w3.org/TR/2003/PR-PNG-2003
nilab 2011/02/18
Portable Network Graphics (PNG) Specification (Second Edition) - 13.16 Alpha channel processing

alpha_channel

png
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How To Optimize PNG â€” Smashing Magazine
This post describes some techniques that may help you optimize your PNG-images. These techniques are derived from laborious hours spent on studying how exactly the PNG encoder saves data. Weâ€™ll start with some essentials about the PNG format and will then move to advanced optimization techniques. As a web designer you might be already familiar with the PNG image format which offers a full-featured
nilab 2010/08/18
Clever PNG Optimization Techniques - Smashing Magazine

graphics

imageprocessing

png
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pngcheck Home Page
pngcheck verifies the integrity of PNG, JNG and MNG files (by checking the internal 32-bit CRCs, a.k.a. checksums, and decompressing the image data); it can optionally dump almost all of the chunk-level information in the image in human-readable form. For example, it can be used to print the basic statistics about an image (dimensions, bit depth, etc.); to list the color and transparency info in i
nilab 2009/08/05
pngcheck Home Page : PNGã®å„ç¨®æƒ…å ±(è‰²æ•°ã€ã‚¢ãƒ«ãƒ•ã‚¡ä½¿ç”¨ã®æœ‰ç„¡ã€åœ§ç¸®ãƒ¬ãƒ™ãƒ«ãªã©)ã‚’å‡ºåŠ›ã—ã¦ãã‚Œã‚‹ã‚³ãƒžãƒ³ãƒ‰ãƒ©ã‚¤ãƒ³ãƒ„ãƒ¼ãƒ« : pngcheck verifies the integrity of PNG, JNG and MNG files (by checking the internal 32-bit CRCs [checksums] and decompressing the image data);

png

tool
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