IMac 27-inch display at brightest is darker than MacBook Pro

I'm using Photoshop to create illustations for a marketing video, shifting the work between a 27-inch 2012 iMac and a 15-inch 2009/2010 MacBook Pro. When I move the work from the IMac to the MacBook, the images are way too bright. Conversely, from the MacBook Pro to the iMac, they appear way too dark. I have set the iMac display to its maximum brightness and dimmed the MacBook Pro almost to the level where it loses contrast. I have a Huey calibration system, but it's no help in this situation. Ambient light does not affect the general appearance on the 15-incn screen, with automatic adjustment off.
My illutrations will be included in an iMovie HD video for use on the Internet. I need a brightness and contrast combination that will look good on YouTube and various websites. Previous videos were okay, using illustrations from the MacBook Pro and an older Mac Pro with 23-inch Cinema Display (no longer in service). This suggests I should trust the laptop as the final setting rather than the iMac. If so, does that render the iMac defective for this kind of work?
I did try various display settimgs under System Preferences, but it's a question of what matches best with YouTube and other websites.
Suggestions anyone?
Thank you!

Hi, sparky96,
I do not have a satisfactory solution. The best I can do, as a work-around, is adjusting the iMac to its brightest setting, moving the MacBook Pro brightness several notches darker, and then aiming for a compromise in the image I'm working on.
As a result, I have no idea what someone else sees on his or her computer. However, that might be the case even if I could match the images on my two Macs. Others might have PCs that display reds as browns, for all I know. I do know that when I view a video on YouTube, it looks more or less the same on each of my computers. The human eye seems to make its own interpretive adjustments.
I have similar problems preparing artwork for printing. No matter what I do to calibrate the displays, the output from my various printers never looks right, and when I get back a book cover that's been printed on an offset press, I'm happy if it's reasonably close to what I get from my desktop printers.
I wish Apple, and Adobe, and Hewlett-Packard, and commercial printers and the whole industry would devise some kind of universal standards -- but I doubt that will ever happen.

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