Question

I have provided a link to a UIKit test app which displays three different images, side by side, each inside a separate MTKView. Each image is tagged with a different color profile:

Display P3
uRGB
Test RGB

我为所有彩色空间和格式设定了缺省值。然后,我检查图像是否贴上标签,如果是的话,我就从有色空间中推翻这些价值。

The variables I am setting:

“workingColorSpace” in the Metal CIContext, default = sRGB
“workingFormat” in the Metal CIContext, default = RGBAf
“outputColorSpace” in the Metal CIContext, default = displayP3
“colorPixelFormat” in the MTKView, default = bgra8Unorm
“colorSpace” in a CIRenderDestination that I use in the MTKView delegate draw method

“宇宙空间”违约值 = CGColor SpaceCreateDeviceRGB(CGC)

我还在CIRenderDestination与MTKView.colorPixelFormat中确定了“pixelFormat”。

If the image is tagged, I override the following values with the tagged colorSpace:

CIContext.workingColorSpace
CIContext.outputColorSpace
CIRenderDestination.colorSpace

如果挂图的彩色空间是真的,那么我就把CIRenderDestination.color Space确定为延伸SRGB,忽视了有色的宽加宽色空间的彩色空间,并确定了彩色PixelFormat = bgr10_xr

Results:

The above scenario will properly render the DisplayP3 image, and the uRGB image. The “Test RGB” image fails:
If I do not override the CIRenderDestination.colorSpace with a value from the tagged image, then the “Test RGB” image succeeds, but the “uRGB” image fails to render properly:

Question: Do I have everything hooked up correctly and, if so, why does one image fail, and the other succeed?

与抽样项目的联系:

https://www.drop Box.com/scl/fi/57u2fcrgdvys7jtzykzxt/Color Space Research.zip?rlkey=unjeeiu7mi0wx9wfpylt78nwd&dl=0

Answer 1

我认为我解决了这一问题。对于一个没有宽松的Ga图象,我把彩色空间放在MTKView的底金属门上(iOS/Catalyst不能让你直接在MTKView上确定):

在MTKImageView.swift,替换:

if isWideGamutRGB {
    self.colorPixelFormat = MTLPixelFormat.bgr10_xr
}

注

if isWideGamutRGB {
    self.colorPixelFormat = MTLPixelFormat.bgr10_xr
} else {
    if let metalLayer = self.layer as? CAMetalLayer {
        if let colorSpace = image.colorSpace {
            metalLayer.colorspace = colorSpace
        }
    }
}

All three image now properly display for me:

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