Photoshop filters

for some reason i can use only the BLUR, NOISE, SHARPEN, STYLISE and OTHER... all the other filters are "gray"... you cant choose them... :S

i tried opening a new file but it didnt help...

i think it is something about the color pallete properties or something...

any idea?

Check to see that the image mode is 8bits/channel.

Image/Mode/8bits

Seems like 8bit or check mode/RGB

Johnt

yup that was it... thx...!

now Q... y doesnt the filters work on 16 bit color? or wt is that 16\8 bit stand for?

8Bit is 8 bits per colour per pixel for a 24 or 32 total bits per pixel image.

24Bits per pixel == RGB
32Bits per pixel == RGB+Transparency

A 16 bit per colour per pixel image just allows a much wider range of colours, contrast and other pixel detail.

Mostly the 16Bit images are used in high end P&S digital cameras, and most digital SLR cameras. They include the extra pixel information so that you can adjust colour temperature, white balance, and other aspects of the image, without affecting the detail contained within the image, or the original pixels recorded.

Some filters simply can't handle 16Bit per colour per pixel images.

OK, I don't believe that I have an authoritative answer for you. But, I've always understood that it's a question of the mathematics involved and the subsequent processing required.

I do know, that for most applications, though 8bits has less detail than 16bit, visually it's almost impossible to tell the difference from a print of the image. There are probably exceptions that I haven't encountered.

//...and what Axe said too.

hehe


Thank you both...

Basically the 16 bit colour space allows for a much more subtle range of colours & tones - which while not visually distinguishable (like dM says) to a regular 8 bit image (which can still potentially house 16.7million different colours), but when you're making post-processing adjustments to a photo, it gives you MUCH more room to play & recover the image if things get lost (highlights, shadows, contrast, etc).