Composite output is greyscale

[dooman87]

ImageMagick version

7.1.0-6

Operating system

Linux

Operating system, version and so on

Debian Buster

Description

When using composite command the generated output is greyscale, but source images are not.

The image was generated as expected on version 7.0.7-2, but broken on the latest.

Steps to Reproduce

1. Run composite -gravity Center image_resize.png canvas.png result.png
2. Check that result.png is greyscale, however image_resize.png is not

Images

image_resize.png

canvas.png

result.png

[snibgo]

When images are uploaded, they get renamed to 134675441-04055200-9840-4906-a831-62c0c1f9a021.png and similar, so I don't know which image is which. Please edit your post to show the name before each image.

For IM v7, I suggest using "magick", not "composite" or "magick composite". Put the input files in the opposite order (background first, and foreground second). If the background is grayscale, then the result will be grayscale. Use "-colorspace sRGB" to ensure it has three channels: R,G and B.

[dooman87]

Thanks @snibgo. -colorspace sRGB solved the problem!