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Thread: equiluminance and tiled images

  1. #1
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    Dec 2011
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    equiluminance and tiled images

    I am a graduate student and I use simple high-contrast black and white patterns as visual stimuli to study visual attention. I am using photoshop to create new images from one specific image, by tiling the pixels of the original image, and using the texture tools in photoshop such as 'ripple' and 'raindrops'...BUT I want to make sure that the images I'm creating this way are equiluminant (avg luminance of whole image, not regions of image) to the original image pattern. I have created the original image using a luminance layer, but I'm concerned that by scrambling and tiling pixels, I'm changing the overall average luminance....any suggestions? If it helps, the reason I need my images to be equiluminant is that I am presenting them in distinct spatial locations but at the same time and I do not want differences in luminance to bias visual attention to one stimulus location over another.
    Any comments/suggestions would be helpful!
    Thank you.

  2. #2

    Join Date
    Nov 2011
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    Re: equiluminance and tiled images

    Do Filter -> Blur -> Average and measure resulting gray pixels.
    Last edited by vladimir; 6th December 2011 at 05:08 AM.

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