rhudston wrote:
I am trying to have some images printed but they keep coming back with a yellowish cast. First I tried the Costco photo lab, and I thought it was their error, so I went to a local photo lab to have prints made. Same result. They told me I needed to calibrate my monitor so I could see the image as it would be printed. I bought a Spyder device to calibrate my monitor, but soon found it was not possible to get my monitor to agree with the actual prints. Next I bought an Acer monitor which is supposed to be 99% accurate in Adobe RGB. I brightened the digital images with Capture One, saved them as Adobe RGB .jpgs and took them back to the photo lab. One of the images is a black & white scene of trees and snow, and I raised the blue tones to make the snow even whiter and remove any vestige of yellow. I had test prints made this time - 5 x 7 - and they are still yellowish. So frustrated. What am I doing wrong? In one of the of the images the subject is wearing a blue checked shirt, but the print shows the shirt as almost grey. In another the subject's face is lit by firelight, but the print is far darker than the digital image. I can't even adjust my monitor's brightness down far enough to be as dark as the print. Am I making some error in saving the digital files?
I am trying to have some images printed but they k... (
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Ex-lab guy here... I ran the color correction department of a portrait photo lab for five years.
First of all, check your environment for adjusting images. It should be very dim. The number one reason prints are too dark is that the monitor is too bright, because the room light is too bright. Be sure that NO direct light is falling on your monitor. A single 5000K CFL or LED bulb bounced off a white ceiling in a corner behind the monitor is about right. You need very indirect, diffused, dim light.
Next, be sure your computer desktop is gray. I'm talking about the monitor desktop, not the desk the monitor sits on, but that should be gray to black, too.
When you calibrate the monitor, use these aim points:
Black Point 0.5 candelas per square meter (cd/m^2)
White Point 80 to 120 cd/m^2 (We used 105 cd/m^2 in the lab)
Gamma 2.2
Initial color temperature setting 5000K at 80 cd/m^2, 5800K at 100 cd/m^2, or 6500K at 120 cd/m^2.
Be sure the monitor profile is enabled in your operating system.
If you save JPEGs at the camera, use sRGB at the camera.
If you save raw files at the camera, the software you use must be capable of converting your specific camera model's raw files.
If your software has a color management control panel, set similar settings as in example one, below.
If your software has a way to set different profiles for two different monitors, be sure you choose the latest custom profile you made for each one.
When saving or exporting files, be sure the correct profile conversion takes place. If you edit in ProPhoto RGB, be sure to convert to sRGB for the Internet or conventional photo labs. Reserve other choices for companies that request them.
If you print your own work, be sure to install manufacturer profiles for all third party papers you like. Go to the paper manufacturer's website and download the generic profiles. Then install as directed.
Let your software manage color... turn off color management by the operating system or printer. The only exception to this is when the proper OEM paper profile is installed for your printer, and the printer driver can adequately handle the conversion.
If you print black-and-white, fully desaturate JPEG images. If your lab prints B&W on color paper, expect some color cast in their output, anyway.
When you open a raw file, it opens in the color space of your camera, and is converted to a bitmap in the working color space of your editor. When you edit it, you are doing so within the "bounds" of the working color space. That's why you want the widest gamut possible, i.e.; ProPhoto RGB.
The software converts the image from ProPhoto RGB to your monitor profile. You can soft proof if you have a soft proofing profile set up in your software. That puts the printer profile between ProPhoto RGB and your monitor profile, so you see a simulation that is closer to final results. It only works if the profile is current, the printer is calibrated, and the processor is in control, so expect minor variations.