S_Merge is a multi-use software that allows for merging, transforming, adding visual effects, collage creation, watermarking, and more in batch processing.

With S_MERGE, users can also apply individual image options such as perspective transform, cylindrical panoramic projection, overlay of dotted and/or a solid line grid onto the image, and pincushion/barrel distortion correction. Once completed, users can save all or part of the image to a file or individual tiles of the image to maintain the quality and clarity of the original image.
Using S_MERGE can be as simple as processing just one image or batch merging up to eight images, each of which has been individually pre-processed with any or all of the above features. Whether you are merging images for personal or professional purposes, S_MERGE is a reliable tool with many features that can assist you every step of the way.
Version 1.8:
Multiple image load during a single session of file open dialog.
Now can input negative gaps (partial overlaying) and option to skew when collaging.
Now can view source pre-processing command list.
Version 1.7:
64 bit version released as default.
Introduced 0, +- 90 degree and 180 degree buttons in rotate dialog.
Introduced 'delete selected source' button in the align window.
Introduced paste image button within source window where the pasted image REPLACES the contents of that source window.
Version 1.6:
Introduction of batch processing/merging of one to eight images.
New quadrilateral: perspective, affine transforms on images.
New effects: sharpen, blur, emboss and more.
New chroma keying feature.