Support multiple image formats encoded as base64

[Brannon Dorsey]

Right now, runway.data_types.image support serialization via a JPEG encoded image only.

model-sdk/runway/data_types.py

Lines 77 to 84 in b3e2aa7

 def serialize(self, value): 
     if type(value) is np.ndarray: 
         im_pil = Image.fromarray(value) 
     elif type(value) is Image.Image: 
         im_pil = value 
     buffer = IO() 
     im_pil.save(buffer, format='JPEG') 
     return 'data:image/jpeg;base64,' + base64.b64encode(buffer.getvalue()).decode('utf8') 

We should support multiple image formats, as well as exploring support for higher bit-depth images.