ImageMagick wont write text over images

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ImageMagick wont write text over images

Postby dankind » 2008-09-29T22:29:34+00:00

The syntax I'm using is:
Code: Select all
convert \
-font "./verdana.ttf" \
-fill "#101411" -pointsize 33 -gravity "West" \
-draw "text 1,0 'foobar'" \
bg.png \
text.png


This works fine on my debian installation... IM 6.2.4. It is not working on my RHEL installation. I've tried with the yum version (6.2.8).

I've also tried compiling from source -- the same version as my debian box.. 6.2.4, as well as 6.4.4-10.. both of which don't work.

Anyone have any idea what might be wrong/missing? 'convert' does not throw any errors, only it doesn't add the text to the image.

Any help would be greatly appreciated

Dan
dankind
 

Re: ImageMagick wont write text over images

Postby el_supremo » 2008-09-30T09:07:55+00:00

Try rearranging the command slightly.
Code: Select all
convert \
bg.png \
-font "./verdana.ttf" \
-fill "#101411" -pointsize 33 -gravity "West" \
-draw "text 1,0 'foobar'" \
text.png


Pete
el_supremo
 
Posts: 1027
Joined: 2005-03-21T21:16:57+00:00

Re: ImageMagick wont write text over images

Postby dankind » 2008-09-30T10:20:34+00:00

el_supremo,

Thanks for the reply, however it produces the same result. It just writes bg.png into text.png and none of the text is displayed. No errors are given either. If I add the -verbose option, it returns:

bg.png=>text.png PNG 200x35 2000x350+179+216 DirectClass 14kb

If I run:
Code: Select all
convert \
-size 200x35 \
xc:lightblue \
-font "/var/www/html/main/simg/verdana.ttf" \
-fill "#101411" -pointsize 33 -gravity "West" \
-draw "text 1,0 'foobar'" \
-verbose \
text.png


bg.png:

Image

It works fine and prints the text to text.png. But I just can't seem to get it to write on top of the image.
dankind
 

Re: ImageMagick wont write text over images

Postby el_supremo » 2008-09-30T10:34:12+00:00

The problem is with your bg.png image. If you identify it you get this info:
Code: Select all
bg.png PNG 200x35 2000x350+179+216 8-bit DirectClass 13.6kb

This means that the basic 200x35 image that you see is actually on a much larger 2000x350 canvas.
You can remove it with +repage:
Code: Select all
convert \
bg.png \
+repage \
-font "./verdana.ttf" \
-fill "#101411" -pointsize 33 -gravity "West" \
-draw "text 1,0 'foobar'" \
bg_text.png


Pete
el_supremo
 
Posts: 1027
Joined: 2005-03-21T21:16:57+00:00

Re: ImageMagick wont write text over images

Postby dankind » 2008-09-30T11:13:16+00:00

el_supremo,

You rock! I spent 5 hours last night racking my brain over this one. Thank you
dankind
 

Re: ImageMagick wont write text over images

Postby anthony » 2008-10-01T18:28:23+00:00

I would check you bg.png generator, and posibly add a +repage to it.

WARNING: viewing the image in a browser would probably (depends on the browser) have shown you this problem).


In summery. While normally PNG will NOT save virtual canvas size information, it does save virtual canvas offset information, and if present, IM will try to generate a 'canvas size' that is appropriate for that offset and image size.

However IM generated PNG images can save virtual canvas size meta data, so that such images can be used as intermediate layer images. Of course this size information is only available to IM commands, and not to other PNG viewers.

I have re-written IM examples section on PNG and the Virtual Canvas to try and make this clearer.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
http://www.imagemagick.org/Usage/
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anthony
 
Posts: 8732
Joined: 2004-05-31T19:27:03+00:00
Location: Brisbane, Australia


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