Is it possible to increase the contrast on PDFs?

A bunch of my reference solutions are handwritten PDFs, and the writing is very pale. It doesn’t print well. The only way I’ve found to get the writing to print semi clearly is to set the printer to the highest quality settings, but when I do this, it takes upwards of an hour to print a 10 page document; this is undesirable, but the lower quality (with “toner saver” mode off) settings do not work. If I could just darken the pages I could print them.

Any Ideas?

As far as I know, Acrobat is treating your notes as embedded pictures, and as such, needs an external editor to change anything on them. What version of Acrobat are you using (Standard/Professional/Reader), and do you an image editing product installed on your computer (GIMP or Photoshop)?

I was using Foxit, but when I used Acrobat 8.0 Reader I noticed a 2x decrease in time-to-print. When I try the select tool, it only lets me select certain, random, parts of the page. I have a photo editor: “Microsoft Photo Editor”.

Reader doesn’t seem to want to let me copy all of the random bits. It will let me select a rectangle, but it will only copy part of that rectangle; ie all I can get out is a word or a number, when it has let me select a table.

There are no copy restrictions on the file.

This is the problem with using a Page Description Language (like postscript) as a document interchange format, and also a consequence of Print to PDF - you are at the mercy of the program used to generate the PDF. You see, Postscript describes what has to be done to get the desired image on the page - I have looked at the raw postscript for a kerned document, and each letter is placed on the page individually, and not necessarily in order. Selection in a PDF seems to involve attempting to grab all the text elements located within the selection range and then ordering them - which may not correspond to what you actually want, and probably will not give you what you need.

As for the handwritten notes, they will be bitmaps - maybe included as JPEGS, but possibly inserted as Postscript bitmaps into the datastream. Again, these may not be atomic images - whatever generated the PDF could have split the bitmaps into chunks for easier rendering.

Si

If you have PhotoShop open the PDF directly using PhotoShop (select 300 dpi when prompted).

–Adjust the contrast and brightness of the image and resave as a PDF.

– Open in Acrobat and print.

How’s that?

Was this what you wanted to do or did I miss the question?

You might also check the “Options” in the print dialog. Many print drivers give you an option to increase contrast within the print dialog itself.

I don’t have Photoshop, but it seems like Gimp will do it. I’ll download it later and fiddle with it.

ETA: there are no options on my printer to do that. I can just choose a higher resolution.

I’m the only one who made it in to work today so it’s a slow day for me. I could also do it for you if you need me to.

Thanks, but I let the computer print the files over night. It was going until at least 3AM