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iMac colours suddenly went wrong...

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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
Hi all,

I am writing after being at my wit's end trying to sort out my iMac's screen. When we parted company last night everything was just fine, but I got home from work today and the screen has a strange hue to it - black is now a sort of blue. It also looks like the number of colours has been reduced as the shadows from windows looks all screwy, and when I open a video I get those horrible blocks of colours rather than smooth transitions. That I'm colourblind doesn't really help me describe the situation, but I've tried messing around with the colours settings in SysPref and have zapped the PRAM, but all to no avail. Creating another user showed the same issue. I'm on 10.7.5 running on a 2010 3.06 21 inch Intel Core 2 Duo iMac with 4BG RAM - the graphics card is a NVIDIA GeForce 9400 256 MB

Does anyone have a clue what might be wrong? This is driving me up the wall and kind of renders my computer useless at the moment as I do a lot of photography...

Many thanks in advance,

LB
 

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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
Here is a pic taken of my screen with my iPad to show the weird shadows that I'm getting - the attached shots were screenshots from my computer which of course should have though would display normally on other screens!
 

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seble

macrumors 6502a
Sep 6, 2010
972
163
leopoldbloom said:
Hi all,

I am writing after being at my wit's end trying to sort out my iMac's screen. When we parted company last night everything was just fine, but I got home from work today and the screen has a strange hue to it - black is now a sort of blue. It also looks like the number of colours has been reduced as the shadows from windows looks all screwy, and when I open a video I get those horrible blocks of colours rather than smooth transitions. That I'm colourblind doesn't really help me describe the situation, but I've tried messing around with the colours settings in SysPref and have zapped the PRAM, but all to no avail. Creating another user showed the same issue. I'm on 10.7.5 running on a 2010 3.06 21 inch Intel Core 2 Duo iMac with 4BG RAM - the graphics card is a NVIDIA GeForce 9400 256 MB

Does anyone have a clue what might be wrong? This is driving me up the wall and kind of renders my computer useless at the moment as I do a lot of photography...

Many thanks in advance,

LB
Click to expand...

Hmm strange, your colours appear fine here from my iPad. Don't know if anyone else can confirm that and suggest as to why... Maybe take a pic of the monitor with a camera and upload that?
 
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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
Hi Seble,

Thanks for taking a look - I have attached a photo takes with my iPad now - should have thought that a screenshot would look normal on other screens...

Cheers!

LB
 
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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
How about this one to compare with one from my first post?
 

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driftless

driftless

macrumors 65816
Sep 2, 2011
1,486
183
Chicago-area
When I open the second picture on my iMac I can see some blue/purple. It almost looks CA, chromatic aberration, which a photographer has not removed in post. Is that picture one that someone posted on the web? Do you see the blue on industry standard websites?
 
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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
Hi Dornblaser,

That photo was taken by me and there is no CA on the original file, as it was yesterday. Can you also see the colour tint in the photo I took of the screen in the window shadow? It's really odd - all the colours seem to have shifted.

It makes my Logic sessions look really strange!

Cheers,

LB
 
driftless

driftless

macrumors 65816
Sep 2, 2011
1,486
183
Chicago-area
The more I look at it, the more it looks like CA. Try correcting the image for CA in LR, A3 or PS and then looking at it again.
 
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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
I really don't think it can be as the photo was displaying fine yesterday. Also this is a problem with how the screen displays all images, not just that particular one.

Here is another photo of the screen that demonstrates the strange colours appearing in the window shadows.
 

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leopoldbloom

macrumors newbie
Original poster
Aug 4, 2008
11
0
One thought that does spring to mind, does anyone know which plist file container the display settings? It might have got corrupted so trashing it could help?
 
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