The Little Guy Posted March 22, 2012 Share Posted March 22, 2012 I would like to select a color that isn't in an image, any thoughts on the best way? Maybe this isn't even the best way to do this. I am using imagerotate, and for the 3rd parameter, I would like the uncovered area to be transparent. I have done this, but I had to use a color then make every color in the image of that color transparent. so, either what is the best way: A. Is there a good way to do this? B. save every pixel color in an array then loop though the array testing colors that are not in the array and setting that as the transparent value. C. Other. What? Quote Link to comment https://forums.phpfreaks.com/topic/259461-imagerotate-transparency/ Share on other sites More sharing options...
kicken Posted March 22, 2012 Share Posted March 22, 2012 Just use a color for the background that has it's opacity set to 127. $img = ImageCreateFromPNG('blah'); $transparent = imagecolorallocatealpha($img, 0, 0, 0, 127); imagerotate($img, 90, $transparent); ImageSaveAlpha($img, true); header('Content-type: image/png'); ImagePNG($img); Quote Link to comment https://forums.phpfreaks.com/topic/259461-imagerotate-transparency/#findComment-1330060 Share on other sites More sharing options...
The Little Guy Posted March 22, 2012 Author Share Posted March 22, 2012 ahhh!!! good call! Quote Link to comment https://forums.phpfreaks.com/topic/259461-imagerotate-transparency/#findComment-1330101 Share on other sites More sharing options...
The Little Guy Posted March 22, 2012 Author Share Posted March 22, 2012 That didn't work... It uses the color, but doesn't keep the alpha. Quote Link to comment https://forums.phpfreaks.com/topic/259461-imagerotate-transparency/#findComment-1330249 Share on other sites More sharing options...
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