- save as mp4 or mkv movie

README.md

@@ -17,7 +17,15 @@ Currently, it supports imagej tif files, czi files, micromanager tif sequences a
 pip install ndbioimage
 ```
 
+### Installation with option to write mp4 or mkv:
+Work in progress!
+
+```
+pip install ndbioimage[write]
+```
+
 ## Usage
+### Python
 
 - Reading an image file and plotting the frame at channel=2, time=1
 
@@ -57,6 +65,12 @@ with Imread('image_file.tif', axes='cztyx') as im:
     array = np.asarray(im[0, 0])
 ```
 
+### Command line
+```ndbioimage --help```: show help  
+```ndbioimage image```: show metadata about image  
+```ndbioimage image {name}.tif -r```: copy image into image.tif (replacing {name} with image), while registering channels  
+```ndbioimage image image.mp4 -C cyan lime red``` copy image into image.mp4 (z will be max projected), make channel colors cyan lime and red
+
 ## Adding more formats
 Readers for image formats subclass AbstractReader. When an image reader is imported, Imread will
 automatically recognize it and use it to open the appropriate file format. Image readers