Image Processing commands

Convert several files from a format to another:
```
convert img_*.bmp img_%04d.png
```
Resize images of the current folder to progressive jpeg. Resized images will not be greater than 600×600, but the aspect ratio will be respected:
```
convert -resize 600x600 -sharpen 1 -interlace Line * pict%04d.jpg
```
Remove all metadata of a JPEG file:
```
exiftool -all= image.jpg
```
Remove recursively (and in-place) the color profile and comments embedded in all PNG images:
```
mogrify -verbose -monitor -strip ./*.png
```

Massive in-place optimization of all PNG images available in sub-directories:

find ./ -iname "*.png" -exec pngcrush "{}" "{}.crushed" \; -exec mv "{}.crushed" "{}" \;

Same as above, but remove all known chunks, those encoding color profiles, gamma and text, and only keeps transparency chunks:
```
find ./ -iname "*.png" -exec pngcrush -rem alla "{}" "{}.crushed" \; -exec mv "{}.crushed" "{}" \;
```

Lossless optimization of JPEG files:

find . -iname "*.jpg" -exec jpegtran -optimize -outfile "{}.optimized.jpeg" "{}" \;

Kevin Deldycke