problem displaying grayscale images

[David Vinson]

Well, we figured out our problem but I thought I'd share it with the 
list anyway, just in case anyone else makes the same silly mistake.

It turns out we had set the ImageDisplay "Use Source Color Key" = Yes 
and Source Color Key = gray.  So any pixels matching the source color 
key (gray in this case) were not displayed.  Switching this off solved 
the problem.

-dv



On 25/01/2012 15:58, David Vinson wrote:
> Hi all,
>
> I'm using E-Prime 2.0 Pro to display some 8-bit grayscale images, and 
> there are constant display artifacts where certain pixels appear white 
> rather than their "correct" grayscale value, but the images are 
> displayed fine otherwise.
>
> These images are displayed at their original dimensions (ie no 
> stretch), via a simple ImageDisplay object with a relatively long 
> duration.
>
> I've tried these on a few different machines and it happens reliably 
> across different hardware, using different display resolutions, 
> different timing etc. These artifacts are not apparent when previewing 
> the images in other graphics packages, so it's not simply that my 
> images have become corrupted.
>
> It seems to be the same pixels every time, and there is sure to be a 
> very simple explanation I'm somehow overlooking?  Anyone?
>
> [Yes I realise this is a perfect query for E-Prime Support staff. But 
> I bet I'll get a quicker answer this way].
>
> Thanks!
> -dv
>

-- 
David Vinson, Ph.D.
Senior Postdoctoral Researcher
Cognitive, Perceptual and Brain Sciences Research Department
University College London
26 Bedford Way, London WC1H 0AP
Tel +44 (0)20 7679 5311  (UCL internal ext. 25311)


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