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ID	Category	Type	Reproducibility	Date Submitted	Last Update
0000458	[In-Portal CMS] Data Management	bug report	always	2009-12-18 11:50	2010-05-11 03:00

Reporter	alex	View Status	public
Assigned To	alex
Priority	normal	Resolution	fixed
Status	closed

Summary	0000458: Scale image quality setting is incorrect for PNG images
Description	In ImageHelper we have method called ScaleImage. In the end of process it does, it saves image with functions such as imagejpeg, imagepng, imagegif, etc. These functions take quality parameter, and we pass hardcoded quality value = 100. But imagepng function may have only 0-9 value range, and if quality is not in this range, it saves broken image file. So resize/watermarking never worked for png images. Note: png quality parameter values are reversed related to jpeg: 0 means no compression, and 9 means highest possible compression. I think we need to investigate about other image saving functions, what quality values they take. Also, as improvement, we may add configuration value for resized image quality, so site administrator will be able to control size-quality balance.
Additional Information	We use 100 as image quality for resized images. This is not always true, see image function description above: - imagejpeg - 100; - imagegif - doesn't have quality parameter at all; - imagepng - 9. That's why all resized PNG images are broken in result (just black). Maybe value of 100 at least worked some how before PHP 5.2 or maybe we were not using PNG images a lot in our projects.

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