Re: How to PHP get bit depth of a given PNG image file?

Thank you Mattias, I'll look at channels again. Regards, Nam On Thu, Jun 16, 2011 at 1:06 PM, Mattias Thorslund <mattias@thorslund.us>wrote: > 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. > > Cheers, > > Mattias > > > -- > PHP General Mailing List (http://www.php.net/) > To unsubscribe, visit: http://www.php.net/unsub.php > >