How to merge 2 images (border, actual image) with different sizes into 1 in linux-CodePudding

I have around 2500 images. Some of them contains border while others arent. What I want to accomplish is to add border to the ones that doesn't have any.

Images with border are 64x64 and images without border are 56x56

I prepared a border image file with size of 64x64 in PNG format and I want to merge all files without border within this image to get them borders and output them as PNG format aswell.

I have tried several ways using ImageMagic but no luck so far.

CodePudding user response：

If you make a 64x64 lime-magenta gradient as background.png and a solid blue 56x56 image as foreground.png like this:

magick -size 64x64 gradient:lime-magenta background.png                 
magick -size 56x56 xc:blue foreground.png

Your command to paste the foreground into the centre of the background is as simple as:

magick -gravity center background.png foreground.png -composite result.png

CodePudding user response：

I figured out it's pretty doable with convert tool from the ImageMagick package.

First I extracted all images with size of 56x56 to different location, then I did the following;

I added 4 pixels on each side since my border is 64x64

for image in ICO_*.png; do
  convert -page  0 0 border.png \
    -page  4 4 $image \
    -background none -layers merge  repage $image-withBorder.png
done