Is this even possible ? (to detect if uploaded image is B&W or color)

[2levelsabove]

I am using GD 2.0 and Imagemagick.

 

Anyone know how to detect whether uploaded image is color or black and white ?

 

I have asked this question on numerous places but no answers ever.

 

thanks

 

[papaface]

http://uk2.php.net/manual/en/function.imagecreatefromgif.php#70280 Should help

[obsidian]

Since images don't have a specific heading or flag accessible within PHP as to whether or not they are color or B/W, you could quickly scan the image pixel by pixel and gather all the colors used within the image. You would then be able to parse the list and see if anything besides gray scale was used... Check the imagecolorat() function to see how to read the individual pixel colors.

 

Hope this helps point you to a viable solution.

[2levelsabove]

Thanks so much. I will take a look at it and post the results here