How to resize an image made up of 2x2 pixel blocks down to corresponding single pixels?
I have an image made up of "pixel blocks" of size 2x2 (so that each block is made up of four pixels of the same color). How can I scale the image by a factor of 2 in each direction so as to reduce each 2x2 block to a single pixel (1x1), without any type of smoothing? My preferred graphics tool is GIMP, but I obviously accept answers based on any tool! /Andreas
Even if your original image dimensions are odd, you can avoid blurring when scaling down by selecting "None" as the interpolation method in the Scale Image dialog:
- Select Scale Image... from the Image menu.
- Select "percent" as the unit in the Image Size section.
- Enter "50" as the width and press enter. GIMP will set both the width and the height to 50%, and round them up to the nearest pixel.
Select the interpolation method "None" in the Quality section.
Click the Scale button.