Support for image BLOBs

[GoogleCodeExporter]

Consider support for BLOBs that are in common image formats (png, jpg, FITS). 
It's too easy to get carried away with features when displaying an image, but 
the only control I would feel is fairly necessary would be a way to adjust 
contrast (especially FITS since they do not specify a palette).

Original issue reported on code.google.com by [email protected] on 23 Mar 2013 at 3:48

[GoogleCodeExporter]

This would be very nice but a simpler acceptable alternative would be just to 
allow specifying a helper program, such as ds9.

Somewhat separate from the display issue, each defBLOB seen should produce one 
Property entry in GUI. Each provides two toggle buttons: "Auto save" and "Auto 
display". When either is first turned on, indiprop sends enableBLOB/Also. When 
both are turned off, it sends enableBLOB/Never. Whenever a matching setBLOB 
arrives and "Save" is On, it is saved to disk with name X.Y.Z.format, where 
format is as specified in the message; ok to just overwrite if file already 
exists. If "Display" is on, indiprop save the same way but then also invokes 
the helper program with file name as its first arg.

Original comment by [email protected] on 23 Mar 2013 at 7:09

[GoogleCodeExporter]

Now it seems our current project will have at least one such property that will 
update fairly rapidly (Hz or so) and a separate ds9 for each would not be 
useful. So the interest in direct support for displaying BLOBs that contain 
FITS files is high for us. The only imaging control required would be contrast, 
no measurements etc etc. Thanks.

Original comment by [email protected] on 29 Mar 2013 at 5:38