001+ PNG to JPEG conversion:
002+ Warning: imagecreatefrompng(): gd-png: fatal libpng error: Incompatible libpng version in application and library in %s/jpeg2png.php on line 5
001- PNG to JPEG conversion: ok
002- Generated JPEG to PNG conversion: ok
003- JPEG to PNG conversion: ok
004- Generated PNG to JPEG conversion: ok