adjustments not sticking - please advise

yanger

I scanned an image on a scanner, and it came out as a pdf, converted to tiff for processing, and usually, the tif image is ok to work with, but for some reason, I cannot work with any of the tif images that were created. I have also tried png and jpg and they also cannot process.

what i am doing is scanning a B+W lineart with lots of background due to thin paper (passing through when scanning) so to fix that after scanning, the image is processed through a batch program in adobe photoshop, and what the batch program does, is brighten by +65 and contrast +65. I manually tried it first, and it didn't work. I also tried the image in Elements, and it would not brighten/contrast. please advise if the image is bad or something? I have a sample attached.

yanger · Posted: Thu Jul 24, 2008 9:23 am Post subject:

after checking my options for a few hours, finally realized that the reason it was not working anymore was because my initial scan was in B+W mode. Originally I scan them in Grayscale mode. Probably because it was in B+W mode, it droped all the grays so that explained why it didn't work. When converting from the PDF output that the scanner sends at then to tif format, it re-converted it to grayscale, but since it lost all the quality prior, it went bad.. it was just odd that when you would lighten/contrast the original tiff image, it would lighten and adjust in preview, but when you pressed ok, nothing happened.. probably a glitch or something.. oh well. thanks all.

combiBob · Posted: Thu Jul 24, 2008 10:06 am Post subject:

You could try to convert the bitmap you posted to grayscale, then convert it back to bitmap w/50% threshold clicked on. All the junk should disappear.

Good luck.

mattyboy777 · Moderator

Hey yanger,

Thanks for posting the solution, this is quite a common problem when scanning low (or no) colour images.