On 06/15/2011 10:11 PM, Nam Gi VU wrote:
  Hi everyone,

In PHP code, given an .png image path, I need to detect the bit-depth of
that image. How can I do that?

I've tried to use getImageSize() and read the bits as below sample code but
it always returns '8' for 24-bits/32-bits image.

Reading the manual, it says:

channels will be 3 for RGB pictures and 4 for CMYK pictures.
bits is the number of bits for each color.

So, to get the total bit depth, I think you need to multiply by the number of colors, which is in the "channels" element.



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