Add the possibility to convert on-the-fly downloaded images ?

[deb75]

Hello,

Very nice package !

I wonder if it would be possible to add the possibility to convert images as they are downloaded ?

This should be possible on both linux/windows (macOS ?) thanks to imagemagick/convert.

I thought of this idea because of issue #101 and #51. For the first issue, a workaround is given but,
at the expense of being a bit less handy. This first issue could also be solved by converting the downloaded *bmp file
to any other specified image format (png,jpg).

What say you ?

Regards and again, thanks for this nice handy package