You're definitely better off to bring a piece of the old paint if possible. If your camera's color settings are off a bit then it would throw off matching the paint.
I have brought my phone, with the color of my garage and they did match it... That have a great paint station area. Hope this helps.👍
Its better to bring a bit of the physical item you need matched that can be scanned, but a cell phone picture will work. I pulled a color from a shutter once, but a smaller item is easier.
Usually pretty good
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