White text on a black background with text()

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Devin
Devin 2012-2-16
评论： Jonathan Whiting 2016-3-17
I'm having a strange problem: I'm trying to make a figure and save it as a PNG. The figure has annotations which I create with the text() function, like this:
textColor = 'white';
textBackground = 'black';
text(x, y, ...
'my annotation', ...
'Color', textColor, ...
'BackgroundColor', textBackground, ...
'HorizontalAlignment', 'Center');
When I use
textColor = 'white';
There is white text over a black background in my MATLAB figure, but NOT in the PNG. In the PNG there is only a black box with no text. The strange part is that if I change
textColor = 'red';
I get red text on a black background (expected) on both the figure and the PNG.
Does anyone have any idea why this is happening?

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回答（2 个）

Josh Porter
Josh Porter 2014-10-31
I had a similar problem involving black text. If I left the text black, it would export to an EPS file as white, which meant that it couldn't be seen on a white background. (When I opened the EPS file in Illustrator, I could see that the text was actually there, just colored white.)
My solution was to set the text color to almost-almost-black:
[eps, 0, 0]
Visually, this is indistinguishable from black, but to Matlab, it is not black. This fixed the problem.
If your white is not staying white when exported, try using almost-almost white:
[1-eps, 1, 1]
It's hackish, but it works.
Image Analyst
Image Analyst 2012-2-16
"How do I save a figure?" has got to be the most frequently asked question of any time period you want to look at. Have you tried the FAQ? http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions.

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