[ome-devel] RenderingEngine: setting channel colours

[Will Moore]

Hi Jerome,

The best way of doing this is to set the colours on the Channels themselves, then reset the default rendering settings.
This means that whenever any user resets their rendering settings on the image, they will default to the 'correct' colours. 

Here's some (pseudo code) of what I'm doing in Python - Hopefully you can work out the C++
Not sure if you'll have to reload as I'm doing. Try it and see.

You can get channels via pixels,
EITHER via the rendering engine (once you've set Ids etc)...

pixels  = re.getPixels()


OR via the query service...

pid = image.getPrimaryPixels().getId().getValue()
params = omero.sys.Parameters()
params.map = {"pid": rlong(pid)}
query = "select p from Pixels p join fetch p.channels as c join fetch c.logicalChannel as lc where p.id=:pid"
pixels = session.getQueryService().findByQuery(query, params)

for c in pixels.iterateChannels():
	# ??? need to reload channels to avoid optimistic lock on update ??? 
        c = conn.getQueryService().get("Channel", c.id.val)	# could try to skip this step

	c.red = omero.rtypes.rint(r)
	c.green = omero.rtypes.rint(g)
	c.blue = omero.rtypes.rint(b)
	c.alpha = omero.rtypes.rint(255)
	session.getUpdateService().saveObject(c)


Than reset 
session.getDeleteService().deleteSettings(imageId)

If this doesn't work, maybe also try:
renderingEngine.resetDefaults()


 Let us know how you get on,


   Will



On 22 Mar 2012, at 12:11, Jerome Avondo wrote:

> Hi,
> 
> I am trying to set the rendering colours for an image I upload to the server via the C++ API...
> The image upload is all good, but I am a little confused with setting the rendering options...
> I am uploading a 3 channel image, and I set the render settings as follows:
> 
> 	for(int c=0; c<csize; c++)
> 	{
> 		if(c==0)
> 		{
> 			renderingEngine->setChannelWindow(c, float(0), float(255));
> 			renderingEngine->setRGBA(c, 255, 0, 0, 255);
> 		}
> 		if(c==1)
> 		{
> 			renderingEngine->setChannelWindow(c, float(0), float(255));
> 			renderingEngine->setRGBA(c, 0, 255, 0, 255);
> 		}
> 		if(c==2)
> 		{
> 			renderingEngine->setChannelWindow(c, float(0), float(255));
> 			renderingEngine->setRGBA(c, 0, 0, 255, 255);
> 		}
> 	}
> 
> 	renderingEngine->saveCurrentSettings();
> 
> Basically I want my 3 channel image to be red, green, blue....
> However the first two channels appear as white, whilst only the last is blue... I tried moving the saveCurrentSettings() after each channel call, but no joy.
> I'm sure it's something simple, but can't figure it out... 
> Thanks in advance,
> 
> Jerome.
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> ome-devel at lists.openmicroscopy.org.uk
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