Combining convert and composite commands execute as single command

[richard_singh]

Hi,
I have requirement where I need to create lower resolution of image and then watermark image. Is that possible so that I convert higher res to lower res and watermark the lower res with composite command.

Regards,
Richard

[fmw42]

You will need to use convert ... -composite rather than composite to do multiple tasks in one command line. What version of IM and platform are you using? Is your watermark image grayscale or color?

see
http://www.imagemagick.org/Usage/compose/#watermark
http://www.imagemagick.org/Usage/compose/#dissolve

Please read viewtopic.php?f=1&t=9620

[fmw42]

try something like (unix syntax)

Code: Select all

convert \( backgroundimage -resize WxH \) watermarkimage \
-gravity South -compose dissolve -define compose:args=30,100 -composite \
resultimage

Specify the WxH for the resize. Modify the 30 value as desired for the strength of the watermark. And change South to wherever you want the watermark placed. You can add -geometry +X+Y to shift the watermarkimage relative to the gravity.

[richard_singh]

Thanks Fred. I was able to generate watermark image. I have quick question if the background image size is less than watermark image it generates image with partial content from the watermark file. Is there an option to provide so that watermark image re-size to background image.

[fmw42]

I am not sure I understand what size you want the watermark image to be? Do you want it to be as large as the background or proportionally smaller than the background?