Bilinear image scaling error

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Scaling images using bilinear scaling algorithm produces slightly incorrect colors.

Steps to reproduce: 1) Open an image with a pure white background in ShowImage. 2) Make sure the image is not scaled by pushing the Original size button (the magnifying glass with a 1 inside). 3) Open Magnify and hover your mouse over the background to verify that it is #ffffff. 4) Scale the image by pushing Magnify + or Magnify - button or scrolling your mouse wheel, it doesn't seem to matter if you up or downscale the image. 5) Observe with Magnify by hovering your mouse over the background of the image that the background has changed to #fefefe.

[jscipione]

sample image apple26.jpeg