My Professor uses a very hard to see white font colour for about half of his lecture notes.
it is very hard to see on the slides, even worse printed out.
Is there a dynamic way to convert all white text in the entire document to black? hopefully there is a solution with Adobe Acrobat Pro DC which is what i am using, but im open to other suggestions.
In the Accessibility preferences, you can change the way text and line art is displayed. This isn't a permanent change but just changes how the PDF is drawn to the screen.
Related
This question is related to What is the smallest possible valid PDF?, but goes one step further: I'd like a PDF file that is as small as possible, but also invisible.
That means:
it contains no text or other objects (or if that's not possible, only completely transparent ones), and
it has no background (or if that's not possible, a completely transparent background).
When I open this file in a compliant PDF viewer, the background color of the viewer panel should show through completely, and when I embed it in a document on top of other elements, only these other elements should show.
PDF pages have no background color by default (if you need an explicit background you have to draw a colored rectangle that covers the entire page).
PDF viewers will use a default white background to simulate a paper page, so the actual background depends on the PDF viewer.
When you place a PDF page on top of another one it will not block the underlying content if it does not have an explicit background.
I'm new in Adobe Illustrator and I just need to extract one element from EPS-file.
So it's the light. And as you see in the attached file, I can't save it clean.
I mean, when it has a some background, it looks good.
But when I remove this background and trying to save the clean light as PNG image this is what happenes.
Here's the demonstration
How can I fix it?
It appears to me as if you need to select that image in illustrator then open your align pallet and select the option "align to artboard" then click the vertical align button then the horizontal align button. Then go ahead and try saving your file. It should take care of the problem.
When I change the color of the text I get the following result:
What is creating this black border?
This problem occurs when I'm generating a PDF using flying saucer, with an embedded font, and try to change the color on h1, h2, etc. If I dump the html flying saucer uses to generate the PDF to disk and open it in Chrome the color change is applied correctly, with no weird black border.
A font program contains all the path construction operators that are needed to draw a set of glyphs. When you use a glyph from a font, these drawing instructions are executed along with a path painting operator. By default, the path painting operator is a "fill" operator. No borders are drawn, the shape is just filled using the current fill color. This is called the default render mode.
Other rendermodes are for instance "stroke" which draws the outlines of the glyph using the current stroke color, but doesn't fill it. Or "fill and stroke" which draws the outlines using the default stroke color and fills the path using the default fill color. There's also a render mode "invisible" in which case nothing is stroked, nothing is filled.
Looking at your image, it seems like the render mode that is used fills the glyph in gray and strokes it using black (and the line width seems to be quite thick). If I had to guess, I'd say that you're trying to mimic "bold". The best way to draw text in bold, is to switch from a regular font (e.g. arial.ttf) to a bold font (e.g. arialbd.ttf). Unfortunately, not every font has a bold counterpart (e.g. there's arialuni.ttf, but no arialunibd.ttf). In that case, bold is mimicked by changing the render mode to "fill and stroke" and the line width is changed to give the glyphs a bold appearance. This could be what is happening in your case.
Check your HTML: are you by any chance talking about text that is in bold? If so, maybe you should change the font along with the color. That way, you'll use a true bold font instead of a pseudo false font.
DISCLAIMER: I don't know Flying Saucer and I don't want to know it. Flying Saucer is using iText for PDF generation. iText is a library I wrote, but Flying Saucer is using it without having established a business relationship with iText Group NV, which is a company I run. Hence it's the responsibility of the creators of Flying Saucer to support their software.
i'm trying to highlight text in a pdf, and have the highlighted rectangle to be drawn under the text.
It works fine on most PDF's, but I jumped into a problem when the text I'm trying to highlight has an image/background under it. The problem is that the highlight rectangle is drawn under the image as well, so it is not visible.
The drawing order I have is this:
draw a blank rectangle with the page size
draw the highlight
draw the pdf using CGContextDrawPDFPage(context, page);
Is there a way to draw the PDF images and text separately? so that I could go
blank rectangle
pdf images/background
highlight
pdf text
Do I have to do something to the pdf / context so that it draws it automatically the way I want it to? I've tried messing with the context but nothing worked so far, it's all drawn entirely under or entirely above the full pdf
Every reader I've seen does this (PDFExpert, GoodReader, iAnnotate to name a few), so it can't be impossible, I just haven't found the solution yet :)
Any help will help, thanks in advance!!
Cheers
My understanding is that these other apps are reading and rendering the PDF themselves (they support selecting text, or adding annotations, for example), so they would be able to much more easily layer things in the way you're mentioning.
The CGPDFDocument you're starting with is an opaque object (in the OO sense, not transparency) that can draw itself, but I don't know of any way to break out and render various sublayers of the document.
As a way forward, you could look at using Core Image (iOS5+) or some other method to blend the highlights layer with the PDF. If you used the right filter (Multiply, maybe), the darker text would still come through and a .3 alpha highlight would blend with any background.
I am having some problems with the PDF files that I make using the PDFSharp library. The files are ok as long as I am viewing them normally.
However I need these files to be changed using the accessibility options (Edit -> Preferences -> Accessibility (in the left menu Categories) -> Report Document Colors -> Custom Color). Whenever there is image with transperancy and/or transparent masks and the Background color is set to black everything disappears.
I looked at the PDFSharp code and it seems that they are setting some transparent SMask, which I did not find to do anything noticeable (at least for me), but I am not sure if I disable it will it screw up something that I cannot think of.
Most probably I won't get help on this one, but I hope that someone knows something more about this problem with PDF Transparency and the Accessibility options.
The transparency mask is created for images with transparency only.
So if your images contain black lines and a transparent background and you change the color of PDF pages to black, you will see black lines on a black background - you will see nothing.
If your images contain black lines on a white background, you will see your image as you know it: black lines on a white background.
Transparency is a feature, it's optional.
Maybe there's a bug in PDFsharp. If I watch the output of the Graphics sample with black background color, pages 4 and 5 are completely black (looks wrong to me).
The output of the Hello MigraDoc sample looks correct to me. The image on page 1 does not use transparency and keeps it white background, the chart on page 6 is transparent (which leads to black lines on a black background).
But maybe that's a bug in Adobe Reader - everything looks fine if I do not set a background color, but activate the transparency grid instead.
If you think that your images do not contain transparency, then we'll need files (PDF and image) for further examination.
Edit: I just checked the output of the Graphics sample with Adobe Acrobat 5 - all pages display correctly even with black background color. With Adobe Acrobat 8 and Adobe Reader X pages 4 and 5 are black. Looks like a bug in Adobe Acrobat/Reader to me.