Posted 30 August 2011 - 12:21 PM
This is a rather new problem, because, I expect, of the growing use of .png files. The problem shows up in two forms, depending on whether the file’s content is black text or colored.
1. I want to download a graphics file from Wikipedia (this file is from Wikimedia and should be freely available). I double-click on the file, and it appears in a convenient size on a grey-checkered background (indicating a transparent background, the apparent root of all the trouble), as an .sng file (whatever that is). I have the option of displaying it as a .png file in several sizes; whether I do this or not makes no difference to what follows. I right-click on the image and get a menu. I click “Copy Image,” and the program appears to do just that—but when I go to paste it, I get a black rectangle. At no point am I offered the option of selecting a background color (if I could order a white background, the problem would probably not exist).
2. I want to capture a graphics file from the internet. I right-click on it and copy it (as a .png file), but when I paste it the background is black and the text hard to read.
Now, I have learned that this is because the original background was transparent and the copied text is displayed against a default black background. But what do I do about it? Irfanview, which in general I find an excellent program, can probably do this, but if I save the file and open it in Irfanview, I can’t figure out how to use the Floodfill tool in the Paint Dialog Box, and if I try to use “Set Background Color” in the Insert Text menu it just whites out everything, including the preexisting text.
I believe that the problem is the background color, but I don’t know how to change it. TweakPNG seemed promising, but when I try to use it to change the background color, it only tells me “multiple background chunks not allowed”—so what good is it?