Pic quality

[ghosh]

Dear friends
Recently I was asked by a painter to photograph his paintings for copy right purpose. I took all the pics in negative ISO 100. When I developed the photographs I found that all the pics had a different color, though it is some thing that is not visible easily. But some one who is good at recognizing color will find out quickly. Can any one tell me what could have been the "X" factor?

I took all the pics in F5.6 and at 1/60.

I also have one more question
Can a higher F number such as f11 would produce better color in this case as well as in other cases.

[Longwatcher]

I would have to suspect the reason for the difference in color is the spectral response of the film (or development process) verus the spectral response of human eyes. Meaning the film sees something different then people will.

Also changing f-stop on lens is unlikely to affect color (at least in the manner you need). However a different lens might provide better (or worse) color as some are coated to provide a more accurate color response.

Also the light itself (especially if using artificial light) will affect the final color of the shot, even if it looks correct to your eye.

Lastly I presume you were shooting film. If shooting digital then the sensor will also have an effect on the colors. As some one once said, buying a digital camera is buying into a permanent roll of a specific film type.

Hopes that helps a little bit,

[PhotosGuy]

I would have to suspect the reason for the difference in color is the spectral response of the film (or development process) verus the spectral response of human eyes.

+ the different spectral response of the pigments used. Maybe + the dufus in the lab who's making the prints?

Film/digital? Lighting setup? Example of the images?

Lots of threads here on copying paintings, but search results don't have a long shelf life, so it's better if you do it yourself.

[chtgrubbs]

If your lighting and exposure are consistent, the the problem is with your color printer. When negatives are run through a printing machine the color balance of the negative is scanned by the machine and adjusted automatically, so subjects of varying color balance and composition will cause the machine to adjust the color balance to try to make the overall print. When I shoot items that need consisten color balance, I put a gray card in the first frame and tell the printer to balance on the gray card and print the entire roll with that color balance.

[ghosh]

Thanks every one. I think the problem should have been with the printing person.