Quote by SquirrelLuvsPnutThank you so much for answering. Would you say
that the artifacts appear the most in the smaller monochrome scans? I rescanned the one monochrome scan in a higher
resolution and it is still standing (for now, I suppose).
The artifacts are present in every scan but when there are less details and the colors are simple or monochrome, they
are more prominent. especially on red surfaces.
I hadn't noticed the two scans left, sorry for the confusion.. But they weren't better than the rest.
Quote by SquirrelLuvsPnutIs there a proffered resolution for smaller
scans, or can't resolution help with jpeg artifacts? I often have a difficult time with discerning what is a jpeg
artifact and what is perceived as normal for large scans (the larger the scan, the more lines seem to get less solid,
but there are lots of these in the database so that must not be an artifact). People have suggested that I use GIMP to
reduce jpeg artifacts, but the program looks so nebulous that I have no idea where to even begin. Is there anything I
can do while scanning to reduce the jpeggers (I.E. hold the book down more tightly or remove the top from the scanner)?
Please be patient with me as I do have a congenital problem with my optic nerves which makes it difficult for me to see
detail, but I do my best with magnifiers. I hope this isn't too much of a bother and if it is, please tell me off gently
because I will take it to heart.
The size and the resolution aren't what decrease or increase the amount of compression artifacts. It's the loss of data
either in the process of scanning or saving the scan. Many image editors have the option to adjust the quality when you
save your project. Usually it's in the form of percentage. For example if you save the picture at 94% out of full 100,
you get a worse result than you would at 100. The higher the quality the larger the filesize, although the filesize can
be altered to be higher even if the picture isn't any better, which won't obviously improve the quality.
Just try to save your scans at a higher filesize and if the programs you're using allow, adjust the quality to max.
My scanner's driver allows to choose the JPEG compression before scanning and I keep it as low as possible. Check if
yours can do the same.
I hope this may help you recognize what artifacts are. I scanned the same picture twice, first one is at the lowest
possible compression which I always use and the second one on the right is at the "high compression" option:
look at the black corset and the red areas. the pixelation is data loss which can't be saved anymore. the same thing
will happen when you save your scan at a lower quality.