Bitmap picture in photoshop, cannot alter it?

Question

Hey guys, I had my recent images scanned and they came out fine. The work is in black and white line art and I want to make the lines more crisp (ie: using photoshop's threshold/levels effect).

The image is a bitmap, and I tried converting it to grayscale, rgb, and even cut/pasted the image into these settings, but no matter what I do the image will not change whenever I try to use threshold/levels.

The line art doesn't change or anything, it doesn't react at all.

It is a pdf, and I tried converting it to a tiff but that didn't change anything. Is there anyone here who knows what step I missed? Or why threshold/levels isn't working on the picture?

Answer 1

Some things to check.



Are you talking about a bitmap as in a .bmp file, or do you mean a bitmap as in an image with solid black or white pixels? Because if the image already has solid black and solid white pixels with no shades of grey then the threshold filter won't work.



Do you have a selection made elsewhere? If so click Select > Deselect.



If you have more than one layer, do you have the correct layer selected in the layers palette before applying the threshold?



When the threshold dialog appears, do you have "preview" selected, if not, then select it.



Have you tried restarting Photoshop? It might just be a glitch.



EDIT > you have your answer then - if the picture is already solid pixels it won't work. If you want to be able to do this in future, get them to scan the image as a jpeg, or a greyscale image instead. Actually a bitmap can come in two styles, a .bmp can contain colours and shades of grey. Obviously the one you have doesn't.

Answer 2

Threshold can only work with tones or tints and you do not have them in a bitmap image.



Convert the image to greyscale, add a tiny amount of gaussian blur (the amount will vary based on the resolution) and then try threshold.

Answer 3

establishing a document with Photoshop is uncomplicated. Drag and drop it. less than "save as" elect "jpeg" to deliver on your grandma. it supply you a smaller document (in words of kilobytes) you may also click (in playstation ) on "image" > "Resize" and decide a smaller length on your photo. in case you won't be able to locate the picture resize button, press F1 in playstation that is going to brings you the help document.