Info

This question is closed. Reopen it to edit or answer.

Avoiding coloured pixels in text

1 view (last 30 days)
Carl  Ionstion
Carl Ionstion on 14 Nov 2019
Closed: MATLAB Answer Bot on 20 Aug 2021
Hello
When I add text to a graph, text color is not perfect. For example, if it's blue, when you zoom it there are small orange pixels.
How can I avoid this or change this colormap?
Thanks
  2 Comments
Guillaume
Guillaume on 14 Nov 2019
Edited: Guillaume on 14 Nov 2019
That's the typical behaviour of antialising and is performed so that the edges of the text appear smooth. Why is this a problem anyway?
Carl  Ionstion
Carl Ionstion on 15 Nov 2019
I need it smoothed in monochrome because another program will use them and it's color based and it gets crazy.

Answers (3)

KALYAN ACHARJYA
KALYAN ACHARJYA on 14 Nov 2019
Chnage the color of Text, there are multiple features to change the color of the text
RGB = insertText(I,position,text_str,'FontSize',18,'BoxColor',box_color,'BoxOpacity',0.4,'TextColor','white');
Detail here
  2 Comments
Carl  Ionstion
Carl Ionstion on 14 Nov 2019
Thanks, but the problem is the same, when you zoom the image the colormap used for the text is full of pastel colors and, even if you are using the "blue" color, zooming to a pixel level shows it. I need to change the colorpam used for dithering the text.
KALYAN ACHARJYA
KALYAN ACHARJYA on 14 Nov 2019
If you could share the figure, it may help to illustrates easily.

Carl  Ionstion
Carl Ionstion on 14 Nov 2019
a.png
Sure. As you can see, when you zoom it it's like a disco.
text(0.02 , 0.5 , 'E.On: Electric Water'] , 'FontSize', 8, 'FontWeight','bold','FontName','Century Gothic', 'Color',double([20 35 124])/255);
  1 Comment
Image Analyst
Image Analyst on 14 Nov 2019
What makes you think it's MATLAB doing it instead of the operating system or your video adapter?

Carl  Ionstion
Carl Ionstion on 15 Nov 2019
Probably is has something to do with the operating system, but since there are programs that do that like Matlab and R and programs that don't do that, like Excel, there must be a way to solve it.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!