Image distortion: contiguous black regions of .bmp images mysteriously filled with white

[Laine Stranahan]

Resolved! SourceColorKey was the problem: it was set to black (thus the
black-to-white conversion (or rather black-to-transparent; I now understand
SourceColorKey is for indicating a color (or color range?) to be rendered
(partially?) transparent)), and for the offending images UseSourceColorKey
was set to "Yes" instead of "No". (Non-offenders' had UseSourceColorKey set
to "No".)

Many thanks!
Laine


On Tue, Jul 16, 2013 at 2:41 AM, Vinson, David <d.vinson at ucl.ac.uk> wrote:

>  Check "source color key" for the offending images (upper left quadrant),
> this setting permits partial transparency of a certain color. Maybe it's
> set for only one of your display objects?
>
>
>
> ----- Reply message -----
> From: "Laine" <lainestranahan at gmail.com>
> To: "e-prime at googlegroups.com" <e-prime at googlegroups.com>
> Subject: Image distortion: contiguous black regions of .bmp images
> mysteriously filled with white
> Date: Tue, Jul 16, 2013 3:15 am
>
>
>
> Hi all,
>
>  I'm completely new to E-Prime and have inherited some scripts from an
> experimenter (now-departed) for an eye-tracking study in which one slide is
> presented with a set of images (.bmp) on it, one per quadrant, then the
> next slide displays the exact same images but with one additional image per
> quadrant. Everything displays fine until the second slide, when both images
> in the top left quadrant (and only that quadrant) with significant
> contiguous regions of black suddenly have those regions of black partially
> filled with white as though some sort of smart autofill Photoshop-type
> operation were being applied. (Sorry, no screenshots at the moment.)
>
>  I'm not sure where to begin looking for the problem. Anyone have any
> ideas?
>
>  Laine
>
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