thanx! "Hugh Bothwell" <[EMAIL PROTECTED]> schrieb im Newsbeitrag [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I have a map of the world with all countries. I have > > 250 maps of the same size as png where only one > > country is black, rest is transp. > > Now I neeed to set this country color to blue or red > > to indicate a special spot. > > I just don't want to save the same map double or tripple. > > Good! Makes much more sense. > > Call this like > <img src='country.php?cty=germany&col=255,0,0'> > (functions in bold you will have to write yourself) > ====== country.php =========== > <?php > Header("Content-type: image/png"); > $mapURL = '\images\countrymask\'.MAKESAFE($cty); > > // load image > $img = ImageCreateFromPNG($mapURL.$mapname) > or MAKEDEFAULTIMAGE(); > > // parse new desired color > $newcolor = split(',', $col); > > // find black > $oldcolor = ImageColorResolve($img, 0, 0, 0); > > // change to new color > ImageColorSet($img, $oldcolor, $newcolor[0], $newcolor[1], > $newcolor[2]); > > // ... and return result > ImagePNG($img); > ?> > > Note that depending on how much this gets used, > it may indeed be better (faster, less computationally > intensive) in the long run to use multiple image > copies, ie country_red.png, country_blu.png etc. > >
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