I might have found the cause of the resizing you are experiencing. Looks like it is caused by the forum software.
Each image attachment has some javascript code that checks your computer screen resolution and compares it to the attachment width. If the image width in pixels is higher than 70% of the width of your screen resolution, the image gets resized on the fly.
For other common screen resolutions the resize threshold would be:
1280x1024 resized at 896 pixels
1440x800 resized at 1008 pixels
1680x1050 resized at 1176 pixels
1920x1200 resized at 1344 pixels
I found
one thread which has 2922x4923 pixel sized image attachments to test the forum software resizing, but it does not cause flashing of screen to me or interrupt the reading of the thread. So that problem could still be specific to your computer. Maybe due to processing power, but that is pure guessing.
Assuming you can't get other members to post images that are lower width than the threshold for your current screen resolution, then a quick fix to your issue is to increase the screen resolution of your computer.
How to change your screen resolution in:
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Last edited by SkinnyForum at 18-8-2010 22:27 ]