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hi to all. I've been beating my head against the wall for a couple of days now trying to save a image as a valid ICNS file ( ICNS is the icon format for Mac OS ). Let's say I have a image of 128 x 128. I've managed to get the color and opacity for each pixel but I'm not really sure how the ICNS file format wants this data compressed. I found some pseudo-code but i can't figure out from that what I have to do: http://www.macdisk.com/maciconen.php3#RLE More info about icns file can be found on wiki: http://en.wikipedia.org/wiki/Apple_Icon_Image Does anybody have any good ideeas about this ? As wiki says, ( for example ) the 128 x 128 icns file should have the header it32, the 48x48 ih32, the 32x32 - il32 and the 16x16 - is32 $im = imagecreatefrompng("128.png"); $width = imagesx( $im ); $height = imagesy( $im ); $pixel_data = array(); $opacity_data = array(); $current_opacity_val = 0; for ( $y = $height - 1; $y >= 0; $y-- ) { for ( $x = 0; $x < $width; $x++ ) { $color = imagecolorat( $im, $x, $y ); $alpha = ( $color & 0x7F000000 ) >> 24; $alpha = ( 1 - ( $alpha / 127 ) ) * 255; $color &= 0xFFFFFF; $color |= 0xFF000000 & ( $alpha << 24 ); $pixel_data[] = $color; $opacity = ( $alpha <= 127 ) ? 1 : 0; $current_opacity_val = ( $current_opacity_val << 1 ) | $opacity; if ( ( ( $x + 1 ) % 32 ) == 0 ) { $opacity_data[] = $current_opacity_val; $current_opacity_val = 0; } } if ( ( $x % 32 ) > 0 ) { while ( ( $x++ % 32 ) > 0 ) $current_opacity_val = $current_opacity_val << 1; $opacity_data[] = $current_opacity_val; $current_opacity_val = 0; } } Thanks in advance for any help you can offer.