PHP GD图像水印质量

Question

I'am using PHP GD to copy an image (watermark) on another image. Unfortunately the quality of the watermark is terrible.

I'm using quality 100% as the attribute, but it doesn't help.

Have you guys know any good way to increase the quality?

Regards.

Answer 1

A 90% quality should give you the exact same results and decrease the file size by half (on JPEG, OFC).

Try using ImageCopyResampled() instead of ImageCopyResize() , other than that I don't think you can do anything else with GD alone, maybe Imagick has some other tricks.

Answer 2

Are you using any transparency, or is it just a solid square. What exactly looks bad about the quality? The edges, the whole thing?

I like to use a 24bit transparent PNG for the watermark, and imagemagick to do the overlay, you get a lot of control over the final product that way.

Lots of possibilities for watermark with imagemagick:
http://www.imagemagick.org/Usage/annotating/