ImageMagick - Text into rectangle

Question

I\'m very new to ImageMagick - I\'ve read some documentation and now I came to first real world situation. I have image (300*500) and I have some text which need to be fitte

Answer 1

Since you didn't provide a sample image for testing and applying some text to, I created one with the following command:

convert                               \
   http://i.stack.imgur.com/RfJG6.png \
  -crop 312x513+579+0 +repage         \
   so#12231624-right.png

Using the resulting image as an input, run these three commands to see how it would work (on Linux or Mac OS X):

width=$(identify -format %W so#12231624-right.png)

convert                  \
  -background '#0008'    \
  -gravity center        \
  -fill white            \
  -size ${width}x100     \
   caption:"This is a sample text to test \
the automatic sizing of fonts by ImageMagick." \
   so#12231624-right.png \
 +swap                   \
 -gravity north          \
 -composite              \
  output1.png

convert                  \
  -background '#0008'    \
  -gravity center        \
  -fill white            \
  -size ${width}x100     \
   caption:"This is a even longer sample text. \
It also serves to test if automatic sizing of fonts \
by ImageMagick works as expected: just don't specify \
any fontsize, and let ImageMagick go for the best fit..." \
   so#12231624-right.png \
 +swap                   \
 -gravity north          \
 -composite              \
  output2.png

Resulting images:

 

(The output doesn't match exactly your given frame -- but that's just because my test file still has a white, unfilled border (as part of the image) which I didn't bother to remove...)

In other words: just do not bother to specify any font size using -fontsize. Only give the size of the region which should have the text annotation. Then ImageMagick will automatically pick the best matching font size and use it.