setExtraChannel method
Implementation
void setExtraChannel(String name, ImageData? data) {
if (extraChannels == null && data == null) {
return;
}
extraChannels ??= {};
if (data == null) {
extraChannels!.remove(name);
} else {
extraChannels![name] = data;
}
if (extraChannels!.isEmpty) {
extraChannels = null;
}
}