png
===

Saves and loads png images.

Install
=======

- Mac OSX: brew install libpng
- Ubuntu: sudo apt-get install libpng-dev

Usage
=====

Loading png files
-------------------

`i_pngfile toto.png | o_gtk_image` loads the png toto.png and displays it.

You can load a lot of images by specifying the number of image to load with -n3.
Then define the filename like with printf format.

Example loading toto0.png, toto1.png, toto2.png: `i_pngfile toto%d.png -n3 | o_gtk_image`

It reads at the speed of the reader. 

You may specify the time between each image with `-p`.
Use -p33 to simulate a framerate of 30FPS. 
   
Saving images in png
--------------------

`i_image.sh | o_pngfile toto.png` save the image from your webcam in toto.png.

- Note 1: your webcam may be slow to start and having a black image at first. You can save 3 the third image with option -n3. 
- Note 2: depending on your camera property, the format may not be recognized by the libpng you can convert it with for example in black and white with -fY800. It may not be recognise at all by i_image.sh.

Like for reading, you can save many images with -n and a specific file format.