gradient_background is not simple enough to extract image

BUR #34713 has been rejected.

mass update simple_background gradient_background -> -simple_background

According to the definition of simple_background, those images who have simple_background tag should be easily extracted.
The images which have gradient_background tag cannot be easily extracted.

Edit
Before: I think the images need to be simple enough that they can be extracted with standard Windows paint software.
After: New description should be added to the wiki pages of simple_background and gradient_background which tells users not to use both tags at the same time.

I think that definition is too strict. Even if the background is a flat color, it still may not be easily extracted, due to anti-aliasing or jpeg artifacts.

The above my restriction is too strict for those kinds of images as you wrote. Thank you for pointing out.

While I do think that a gradient isn't "simple", I also think the definition is too strict with regards to film grain, artifacts, chromatic abberation, etc.

The ability to extract the image is a rule of thumb but not a hard rule. That is, the point of that line being there is to give an approximate example of what would constitute a simple background - when you check through all the posts tagged as simple background, you sort of get an idea of what that looks like on a post. There are a lot of wiki definitions that should not be taken literally but rather as a way of formulating a mindset.

If we are changing the definition of simple background to focus more on "ease of extraction" then posts with a white outline like

need to be excluded, or at least doublechecked afterwards. Possibly even the other *_outline tags.

If we do make simple_background more strict I think we would still need a broader tag for backgrounds that are... well, just "simple" colors/shapes and don't have either an intricate design or actual objects/scenery.

"Can be extracted from the background" is a rule of thumb, not a definition. It means the background is an empty void, not a detailed physical location.

A better rule of thumb is to say you can't identify the time or place, whether it's day or night or indoors or outdoors, because the picture isn't set in a physical environment, it's set in an empty void. Another way to put it is there's nothing to tag in the background because there's nothing there.

It's not at all difficult to extract an image from a gradient background...? Most modern graphics editing software will have some variation of the "magnetic lasso" which you can use to easily remove it.

The bulk update request #34713 (forum #323289) has been rejected by @evazion.