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Step 2: Make skin.bmp - the body texture image

Next we need to cut off all the fins, including ones obscuring any part of the body. Size this image to 1000 pixels wide, and expand it vertically to make the height a multiple of 100. Make sure the background is pure black.

Make sure the fish itself contains no pure black pixels that will get mistaken for the background. An easy way to do that is to brighten the image (except for the background) very slightly, say 1%. That will turn any pure black pixels on the fish to dark gray.

Save the file as "skin.bmp". This image will be used to draw the body of the fish in 3D.

Next - Step 3: Make profile.bmp - Define the profile of the model body