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Render RGB text over RGB or Grayscale Image

version (3.83 KB) by Davide Di Gloria
Utility which renders text over RGB o grayscale image matrices. (no line feed support)

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Updated 05 May 2010

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by Davide Di Gloria
with the great contribution of Franz-Gerold Url

Render RGB text over RGB or grayscale images of ANY RESOLUTION!

out=rendertext(target, text, color, pos, mode1, mode2)

target ... MxNx3 or MxN matrix
text ... string (NO LINE FEED SUPPORT)
color ... vector in the form [r g b] 0-255
pos ... position (r,c)

optional arguments: (default is 'ovr','left')
mode1 ... 'ovr' to overwrite, 'bnd' to blend text over image
mode2 ... text aligment 'left', 'mid' or 'right'.

out ... has same size of target

example (generates the sceenshot above):

out=rendertext(in,'OVERWRITE mode',[0 255 0], [1, 1]);
out=rendertext(out,'BLEND mode',[255 0 255], [30, 1], 'bnd', 'left');
out=rendertext(out,'left',[0 0 255], [101, 150], 'ovr', 'left');
out=rendertext(out,'mid',[0 0 255], [130, 150], 'ovr', 'mid');
out=rendertext(out,'right',[0 0 255], [160, 150], 'ovr', 'right');

have fun (and give credit)!

Cite As

Davide Di Gloria (2021). Render RGB text over RGB or Grayscale Image (, MATLAB Central File Exchange. Retrieved .

Comments and Ratings (12)

peng wang


John Morris

Nice functionality. Font size would be good.

Ilya Belevich

Ilya Belevich

very nice, thank you!

Davide Di Gloria


Rob Campbell

Fair enough!

Davide Di Gloria

if you have to write a timestamp or something on a 3000x2000 pixels image, getframe() will shrink the image...

Rob Campbell

I still don't understand the point. Combining text with getframe gives you more flexibility and still gets the job done easily. This function renders in only one font face and (apparently?) only one size.

Davide Di Gloria

This function RENDERS the text over any matrix, not over the figure. This function allows you to save the image matrix with imwrite() and not by using getframe(). Please consider re-rating :)

Rob Campbell

The images are included in the default Matlab install, Stiphu. At least they are on my machine. However am confused by this function. It just seems like an over-complicated and crippled version of the text command. Question to author: What does this function do that the text command does not?


How about adding the pictures you used? Absolutely crab...

MATLAB Release Compatibility
Created with R2009a
Compatible with any release
Platform Compatibility
Windows macOS Linux

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