Many companies use this software for editing photos.
I use this for our company work and this works perfectly for image editing process.
Just Color Picker - Free portable colour picker and colour editor for web designers, photographers, graphic designers and digital artists. Supports Windows and macOS.
GIMP - GIMP is a multiplatform photo manipulation tool.
Instant Eyedropper - Identifying the color code of an object on the screen is usually an involved, multistep process:...
Affinity Photo - Affinity is the imaging and design suite for creative professionals exclusively for Mac.
gcolor2 - GTK+2 Color Selector
Krita - Krita is a professional FREE and open source painting program. It is made by artists that want to seaffordable art tools for everyone. Concept art. texture and matte painters, illustrations and comics.