Docs missing range of values for sharpen parameter

[DH-at-PF]

The example shows 3 but there is no range defined.

https://images.weserv.nl/docs/adjustment.html#sharpen

[kleisauke]

sharp needs to be in the range of 0.000001 - 10000.

images/src/api/processors/sharpen.cpp

Lines 13 to 21 in 03684dc

	// Sigma of gaussian
	auto sigma = query_->get_if<float>(
	"sharp",
	[](float s) {
	// Sigma needs to be in range of
	// 0.000001 - 10000
	return s >= 0.000001 && s <= 10000;
	},
	-1.0F);

And sharpf and sharpj needs to be in the range of 0 - 10000.

images/src/api/processors/sharpen.cpp

Lines 35 to 53 in 03684dc

	// Slope for flat areas
	auto flat = query_->get_if<float>(
	"sharpf",
	[](float f) {
	// Slope for flat areas needs to
	// be in range of 0 - 10000
	return f >= 0 && f <= 10000;
	},
	1.0F);
	// Slope for jaggy areas
	auto jagged = query_->get_if<float>(
	"sharpj",
	[](float j) {
	// Slope for jaggy areas needs
	// to be in range of 0 - 10000
	return j >= 0 && j <= 10000;
	},
	2.0F);

Though, the last two could possibly be increased to a million (1×10⁶), since libvips allows that.
https://github.com/libvips/libvips/blob/e24cee4e224af32d85ab2fd52f57c2482cc87d9c/libvips/convolution/sharpen.c#L356-L368

I'll look into mentioning this on the website.

[kleisauke]

Commit a82438c updates the maximum values of the sharpen operation, documentation still needs to be updated.

[kleisauke]

Documentation has been updated.
https://wsrv.nl/docs/adjustment.html#sharpen