The images folder contains sample images in a variety of dimensions and color formats.
The (imagej/sample-image-info.txt) file contains known format and pixel value information for every file in the test folder. This text file is read by the test system to confirm images are being read properly.
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Open ImageJ (https://imagej.nih.gov/ij/)
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Open the folder of test images
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Select all images and drag/drop the collection onto ImageJ to open them all
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Drag/drop the ImageJ macro (.ijm) file onto ImageJ
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CTRL+R to run the macro
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Copy/paste the output into the .txt file