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# PNGr[A #
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uPNG`v̉摜t@CAP/ECEŕ\܂B

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CXg[@
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1. upngview.pexvAP/ECEɓ]ĂB
2. PNGt@CAP/ECEɓ]ĂB
   PNGr[ÁAt@C̓ePNGt@Cǂ𔻒fĂ̂ŁAgq͉ł\܂B

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㉺{^@@@@@@t@CI܂B
`{^@@@@@@@t@C肵܂B
a{^@@@@@@@j[܂B
rdkdbs{^@@vOI܂B

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Ƃ
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PNG`̕׋ȂAP/ECEPNG`̉摜t@C\APNGr[AĂ݂܂B
P/ECẼ̂߁A܂傫PNG摜͕\łȂ̂łǁAesNZ`ATv[xAC^[[X̗LɁAԑΉłĂƎv܂B
̃y[WɁA\eXǧʂ܂Ƃ߂܂B

OJPEGr[AɈA摜t@CtH[}bg̕׋łB
libpng(http://www.libpng.org/)zlib(http://www.zlib.net/)g΁AȒPPNGfR[hł̂łǁA׋̂߂ɁAlibpngzlibg킸ɎĂ݂܂B
zlibɑ镔́AȑOɍ쐬P/ECEp̊ȗzlib[`̂ł𗬗pAlibpngɑ镔쐬܂B
ۂɍĂ݂ƁAPNG`JPEG`ƊrׂāAȒPȎdg݂Ǝv܂B

JPEG`̏ꍇ́AC^[[XlXȃTutH[}bgɑΉ悤ƂƁA|ȏKvłB
O쐬JPEGr[ÁAlXȃTutH[}bgɑΉ邱Ƃ͒߂āAC^[[XE{IȌ`ɍiđΉ̂łB
APNGr[Ał́A(Ԃ?)Ԃ̃TutH[}bgɑΉfR[hA250sx̊֐ЂƂŎł܂B
ނ땡GȂ̂́APNGzlib̕ŁAP/ECEp̊ȗzlib[`́A1000sx̃W[łB
zlib̂Ƃʂɂ΁APNG`ꎩ̂͒PȃtB^ƃC^[[XŝŁAƂĂՂƎv܂B

PNG`͗Ղ̂łAP/ECEňՂHƌƁAJPEG`Â炢łB
ȂȂPNG`́AfR[h̒ŁAꎞIȃ[NKvƂ邩łB

JPEG`̏ꍇAfR[h̒ł́AꎞIȃ[NقƂǕKv܂łB
摜ŜWJ邽߂̃[N͕KvA傫ȉ摜łsNZPʂŏkȂP/ECẺʂɕ\ł܂B
ɊrׂPNG`̏ꍇAfR[h̒ŁA摜ŜWJ邽߂̃[NKvɂȂ܂B
Ƃ΁AtJ[AAt@tA16rbg̃Tv[xŁA128~88sNZ̉摜fR[h悤ƂƁA܂Ƃ߂100LoCg̃[NKvłB

ɂsȓ_܂B
JPEG`̏ꍇAJPEGt@CtbVŘAĂ΁ARAMɓǂݍޕKv͖AtbṼf[^璼ڃfR[h邱Ƃł܂B
APNG`̏ꍇAPNGt@CtbVŘAĂĂAtbṼf[^璼ڃfR[h邱Ƃł܂B
PNG`̍\AzlibWJf[^PNGt@C̒ŊɂfĂ邽߁ARAMɓǂݍŘAKv邩łB
]āA摜ŜWJ邽߂̃[NɉāAɁAWJOzlibf[^ׂĕێ邽߂̃[NKvɂȂ܂B

PƂāAWJOzlibf[^Xg[ƂĈAÂǂݍݓWJāA1CPNGfR[h΁A傫ȃ[N邱Ƃꉞ\łB
{zliblibpng𗘗p΁Aq̂悤ɏł̂łǁAAVɎobt@ƂāA32LoCg̃[NKvɂȂĂ܂܂B
Ȃ݂Ɋȗzlib[`̏ꍇACɂ܂Ƃ߂ēWJ@ȂɁAWJς݃f[^ƂėpAobt@̃[N͕svłB
Xg[邽߂ɂ̓vOGɂȂAR[hTCY̌ŒIȑ܂߂ė_ƌ_rƁAǂ炪ȃȂ̂ƂłEEE

Ȃ킯ŁAP/ECEłPNG`pIɗp邱Ƃ́AȂȂłB

==================
Wed Apr 01 2009
Naoyuki Sawa
nsawa@piece-me.org
==================
