Merge Channels

This function block combines three single-channel (grayscale) images into a single color image. Use it when you have separate red, green and blue channel images that should be merged into one RGB image for visualization or further processing.

📥 Inputs

• Red Channel Input socket - Grayscale image representing the red channel.

• Blue Channel Input socket - Grayscale image representing the blue channel.

• Green Channel Input socket - Grayscale image representing the green channel.

📤 Outputs

• ImageRGB Output socket - The resulting RGB image produced by merging the three input channels.

🕹️ Controls

• No Controls This block has no adjustable widgets; it performs the merge as soon as inputs are provided.

🎨 Features

• Simple and fast merging of three single-channel images into a color image.

• Keeps pixel alignment if input channels share the same dimensions and coordinate system.

• Works with standard image workflows: merge then visualize or apply color operations.

📝 Usage Instructions

1. Prepare three grayscale images for each color channel.

2. Connect the grayscale image that represents red information to Red Channel input socket.

3. Connect the grayscale image that represents blue information to Blue Channel input socket.

4. Connect the grayscale image that represents green information to Green Channel input socket.

5. Read the combined color image from the ImageRGB output socket and use it with downstream blocks.

Note: For correct results, ensure all three inputs have the same width, height and alignment before merging.

📊 Evaluation

When executed, this block outputs a single RGB image created by combining the three provided single-channel images. If any input is missing or dimensions differ, downstream results may be unexpected—verify inputs before running.

💡 Tips and Tricks

• To split an existing color image into separate channels before processing, use the Split Image block then feed the outputs into this block.

• If channel images have mismatched sizes, use the Image Resize or Image Resizer block to normalize dimensions first.

• Preview the merged result with the Show Image block to verify correct channel placement.

• Before merging, you can denoise or blur individual channels using Denoising or Blur to reduce artifacts.

• Use Adjust Colors after merging to tweak contrast/white balance if colors look off.

• Use RGB Mask or RGB Set earlier in the pipeline to selectively modify or mask specific channel areas before merging.

🛠️ Troubleshooting

• If the final image looks tinted or colors are swapped, double-check that each grayscale image is connected to the correct input socket (Red Channel, Green Channel, Blue Channel).

• If you see errors or distorted output, confirm that all three channel images share identical resolution and orientation. Use Image Resize or Image AutoRotator if needed.

• If the merged image contains noise or artifacts, apply Denoising to each channel before merging.