Operating system: Windows 7, Windows Vista, Windows XP.
Supported input formats: JPG, JPEG, GIF, PNG.
Supported output formats: PDF.
JE-Comics is a java application able to convert a group of images into a pdf. It can take as an input JPEG, GIF and PNG files even if compressed in a ZIP or CBZ file.
It has builtin support for some ebook readers (like Iliad and Sony prs), and some image optimization filters for enhancing the quality of the resulting PDF (brightness, contrast, sharpening and smart smooth).