236         ImageSpec dstspec = A.spec();  in channel_append()  local
237         dstspec.set_format(  in channel_append()
240         dstspec.nchannels = A.spec().nchannels + B.spec().nchannels;  in channel_append()
245             if (std::find(dstspec.channelnames.begin(),  in channel_append()
246                           dstspec.channelnames.end(), name)  in channel_append()
247                 != dstspec.channelnames.end()) {  in channel_append()
255             if (std::find(dstspec.channelnames.begin(),  in channel_append()
256                           dstspec.channelnames.end(), name)  in channel_append()
257                 != dstspec.channelnames.end()) {  in channel_append()
262             dstspec.channelnames.push_back(name);  in channel_append()
264         if (dstspec.alpha_channel < 0 && B.spec().alpha_channel >= 0)  in channel_append()
265             dstspec.alpha_channel = B.spec().alpha_channel + A.nchannels();  in channel_append()
266         if (dstspec.z_channel < 0 && B.spec().z_channel >= 0)  in channel_append()
267             dstspec.z_channel = B.spec().z_channel + A.nchannels();  in channel_append()
268         set_roi(dstspec, roi);  in channel_append()
269         dst.reset(dstspec);  in channel_append()