Re: [Openexr-user] Change Channel names

[Aaron Carlisle]

You're awesome! Ill work with this today, and see where I get.

In addition to changing the channel names I also wanted to be able to combine the channel data from the rgb channels from each layer into one. In python I just created a dictionary, grouped the rgb channels and used array to convert them. So (customlayer.red, customlayer.blue, customlayer.green) became (newlayername.customchannelname(combined pixel data from red, green, blue)). In C++ it doesn't seem seem as simple. Do you have any suggestions for doing the same in C++?

Thanks again!!

On Dec 13, 2015, at 8:48 PM, Peter Hillman <address@hidden> wrote:

You cannot modify a channel name because the ChannelList object keeps them sorted. If you wish to rename a channel within a list, you must delete it and reinsert it with the new name, or else assemble a completely new ChannelList containing the channels the way you want.

You may find the source of the multiview utility instructive:
https://github.com/openexr/openexr/blob/master/OpenEXR/exrmultiview/makeMultiView.cpp
That reads in channels from the input(s) and writes them out with different names.
You could drop a channel from the output file by making these two lines conditional:
header. channels (). insert (outChanName, inChannel);
and
outFb. insert (outChanName,image. channel (outChanName). slice ());

On 12/12/15 08:02, Aaron Carlisle wrote:

In the ChannelList::Iterator and ChannelList::ConsIterator name() is being defined as a const char * name () const, which means I can't change the name. Is there anyway around this? I just want to be able to change the channel name. I tried converting name into a string then back into a const char * which works, but I have significant data loss and the pixels no longer show up in the image.

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