Created attachment 333485 [details] HTML document where the bug appears. Steps to reproduce problem: 1. Open chrome on an external monitor. In my case, a HP 27er monitor. 2. Load the attached HTML code, or go to this url: https://hoydedata.no/arcgis/rest/services/las_dom_somlos/ImageServer/legend 3. Click "Legend (GET)". 4. Inspect the first image, labeled "0", with the Color Picker tool. What is the expected behavior? The image should have the following color value: #aff0e9 or (175,240,233), as verified by GIMP 2 and Firefox Developer Edition. What went wrong? The Color Picker displays the following color value: #aff1e9 or (175,241,233). The color value in the green channel is off by one.
I was not able to reproduce the problem with another monitor, this time a Samsung branded monitor. In both cases, though, the monitor was connected to the HDMI output on my laptop.