What free software to stitch photos that exactly adjoin?

[Joseph Elfelt]

I wrote software that can take a series of screenshots that exactly adjoin.  Each screenshot is part of a map.  Currently I am using an older version of photoshop to stitch the screenshots together into a large JPG.  While this works fine, I am looking for recommendations for free software that will work on a windows 10 PC.

Again, the screenshots exactly adjoin.  There is no overlap to match up.

A typical finished image will consist of 25 screenshots.  5 across and 5 down.

Is Hugin a good choice for this or should I look elsewhere?

[Bruno Postle]

You could do this in Hugin, but it would be easier to use something like ImageMagick which has an 'append' function to do this - Bruno

[Carl Ovenschotel]

When those screenshots have the same resolution you can create a raster of that resolution in Gimp, make that magnetic, and drag the images on the raster. They will snap to the raster and you can then export the image. 25 is nothing. I did this all the time with 140 or so images.

[Joseph Elfelt]

Great! Thanks for suggestions.  Just what I was looking for.

[stuartmm]

For things like this i use the command line vips ( https://www.libvips.org/ ) which has an arrayjoin command .

I find it handles large images better than Imagamagick

join an array of images
usage:
   arrayjoin in out [--option-name option-value ...]
where:
   in           - Array of input images, input VipsArrayImage
   out          - Output image, output VipsImage
optional arguments:
   across       - Number of images across grid, input gint
default: 1
min: 1, max: 1000000

[Joseph Elfelt]

Thank  you Stuart.  vips certainly looks interesting.  I will definitely take a look when deciding on a workflow.