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I am trying to open a greyscale image in *.data format in GIMP, but the only options that I get are multichannel (RGB, RGB alpha, etc.). Is there a way to change this? Thanks.
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Duplicate the original image ( Ctrl+D ) and right-click on the copy. Select Image -> Mode -> Grayscale.
Go to the Colors menu and choose Desaturate > Colors to Gray with the grayscale layer selected. A new floating dialog will open up and give you a preview of what the grayscale image will look like. If it appears too light, select Enhance Shadows. When you're happy with the results, press Ok.
The most obvious way to open an existing image is the menu. Use File → Open to open the Open Image dialog,allowing you to navigate to the file and click on its name. This method works well if you know the name and location of the file you want to open.
File->Open
Choose Raw image data as the file type and find your .data file and open it.
In the proceeding Load Image From Raw Data dialog, set the Image Type to Indexed. Set the Offset to 0 and the Width and Height to the correct dimensions for your data. Leave everything under the Palette section as defaults.
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