Transparent background, update multiple images

Hello,

I have to deal with crap images but that is the way it is.
So I have now 160X160 quality images (which will become small 40X40 icons) in jpg format.
But the background is white, I need to have that transparent.

What is the best way to make that happen (maybe some code in Stencyl directly??)
Or use a tool that will modify like 600 images !

Right so I just want to clear the fact that when I import if I choose the white somehow not all the white is transparent so it does not do the trick

Thanks

photoshop can do batch processing, maybe that will help?

Transparency and .jpeg's don't mix well.

Hmmm I don`t have photoshop, as well I can convert to other formats if need be as long as they are supported by Stencyl..

So any ideas ?

I fear you have tedious work ahead.
The problem with jpeg-s, as you discovered, is that the background (or any other color) is not uniform white, which causes whitish borders when picking it as transparent.
I haven´t found any good way to fix this, apart from manually editing each image and saving as png.

That is what I feared

Does anyone know if there is a way to select all the pixels in an image that are the same color (and not next to each other) ?
I might try to fix the borders problems by selecting those different colors and then making them transparent as well

I read a lot about this yesterday and found a tool that would let me modify in batch, as long as I know what needs to be done.

So I found to change the white color to transparent
But now I probably need to change all the greyscales outside my black line (which is the border of the image) to black pixels.

Is there a way to acheive this ?

This is the tool that I plan to use
http://www.imagemagick.org/script/command-line-options.php

maybe show us some example images?

I think I found the best way to modify my images, but there is one step missing that I need to be able to batch if possible with that tool (or other tricks)

Once my background is transparent, I can select the border and just change everything in greyscale to black (see attached slides)

I go in SumoPaint (on the web)

do a select on the exterior of my image (where it is transparent)
then select borders (change value to 1)
then on all the selected pixels I apply black with the brush

any ideas ?