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Old Dec 21, 2012, 07:36 PM   #1
macrumors 6502
Join Date: Oct 2012
New iMacs Screen Black Crush?

First impressions seeing a 27 inch iMac in Apple store:

I managed to get on to a new 27 inch late 2012 iMac here in the Uk and was able to have a good play around on it to see how it performs. Overall it worked well, although adobe elements was laggy, slow to zoom on occasions even on a white screen "checker boarding" and to re-size its window was laggy. That machine was running a 675mx gfx and a standard 1TB HHD which was painfully slow to use. Other than that it was quite impressive apart from what I am reviewing below.

This is what I am most concerned about, it is the apparent black crush exhibited on the monitor. Now this may just may be software in OSX with its photo viewer but I did also notice that fonts in Safari were blotchy and had too much blue saturation which was strange.

So to quote my findings on this:

Below there are three images, The first a reference of the entire image "upon double clicking it can be downloaded at full size to test if need be" The second a close up of the most affected area "note it looks just like this in windows photo viewer as well" and the third a picture captured on my s3 of the iMac display using is own photo viewer as standard.

Analysis of affected area between "iMac osx photo viewer" and "u2711 win 7 os photo viewer":

The affected area on the iMac shows in the most black areas of the screen there is a loss of detail. Where there is more information on the u2711 the iMac seems to crush the blacks. So on the image showing the fan unit with the orange dot, "the lower portion of that unit which is darker" when displayed on the u2711 it shows fan supports and a radiator behind where the iMac's equivalent image shows just black.

Now I know using a camera to capture the information on the screen in the third photo will reduce the information held within the image but this is pretty much how it looked in the store. I have had problems like this before with srgb and rgb images on my wide gamut monitor but even using an srgb image held within the internet page it shows the information but just not on the iMac.


I have got my computer set up so that srgb/rgb images all work across photoshop, downstream from chrome and windows photo viewer which all display the correct colors, is this even possible on the imac? I suppose you just can't use rgb images which is a shame.

I just don't understand this black crush problem if anybody can help?? Colour gamut can be really confusing at times!

Reference image
Thumb resize.

U2711 "same as what it looks like in windows photo viewer not a direct photo"

Late 2012 imac "what is seen in the mackintosh's photo viewer as a photo taken on my s3"
Haswell or Broardwell MBP? iGPU!

Last edited by dejo; Jan 3, 2013 at 01:05 PM. Reason: Please use [timg] tags for large images.
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