Windows one-click image converter/optimizer

Question

Looking for a Windows software that lets you

• convert images from PNG to JPG or vice-versa
• optimize images, there's several algorithms out there for this, like
• reducing size by reducing the JPEG quality from 100 to ~80 or something
• reduce resolution
• right click on image to bring up the tasks dialog
• bulk operation on multiple images

If it's Freeware, awesome, but paid will do too.

Answer 1

You are looking for Image Magick calls from the command line can:

• Convert images between a lot of different formats
• Optimize to a given luminance and chromanance separately e.g. convert -quality 80,80 somepict.jpg somepict80.jpg
• Reduce size e.g. 'convert "somepict.jpg[100x100]" small.jpg` will resize to a max of 100 pixels.
• Right click: no it is a command line tool
• bulk operations - yes.

Free - Yes and cross platform.

Answer 2

I am not sure if the particular imag-size optimizations will be available out of the box - but for fast, user friendly, image transformation using a Graphical Interface, a nice, if obscure, tool is "photobatch" (or "phatch").

It allows you to put together a pipeline of operaiotions (like resize, rotate, change format) and apply that to whole folders at once. Not sure how well it can be fine tuned to work on a single image from the file navigator.

Ah, I just saw your final requirement for "cross platform" - so I think it is right on.

Home: http://photobatch.stani.be/

Docs: http://photobatch.wikidot.com/