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Old November 28th 07, 03:22 AM posted to alt.binaries.pictures.aviation
Andrew Kalten
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Posts: 1
Default Can I check something with you guys [Solved]

Glenn wrote:
Is this glaringly obvious to you guys as well.


The only way to answer this question objectively is
to subtract one image from the other.

Using Linux/GNU software (it would be very hard to accomplish
on a stock MS Windows system) I converted both JPEG images
to an uncompressed format, subtracted the image data byte
by byte, and then recompressed back to JPEG (to get a smaller
file size for posting).

The subtraction will reveal any discrepancy. If the images
are identical, the values will subtract to zero and the appearance
will be black. The result is attached.

As can be seen, the difference image is virtually all black, except
for a slightly visible band of lightness corresponding to the water
areas. This slight difference, only barely perceptible, is likely the
result of different compression qualities between the two images.

Conclusion: The images are virtually identical. Any difference will
be beyond perception.

AK



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