Is it a good scan?
If you have access to Photoshop, simply open up the image go to Image/adjust levels and the levels histogram will appear. Looking at this will help you to decide the quality of the scan.
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a more detailed explaination go to
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A
good scan
A
scan with missing infomation
A
previously adjusted scan
This histogram tells you that this was a good scan or file. Notice how the graph tails off at before the ends.This tells you that all information is there.
This histogram tells you that this was a bad scan or file. Notice how the graph ends abruptly before the end. This tells you that there is missing information (missing pixels).
This histogram tells you that this image cannot take any more!!, it is known as "hammered". The vertical lines show it has previously been adjusted. They also show that there is is a lot of missing infomation as shown by the gaps (white lines) in the graph.
