Use ImageMagick to create cmyk color pictures, but the cmyk values ​​displayed in photoshop are different!

Hello everyone! I use ImageMagick in PHP to create a picture with cmyk color, but the cmyk value displayed in photoshop is different! For example: the color set through ImagickPixel in ImageMagick is cmyk(0,0,0,100) (black), but when viewed with an eyedropper in photoshop, it becomes cmyk(61,61,61,0). It's obviously not black visually. Please help analyze the reason, thank you!

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Hello everyone! I use ImageMagick in PHP to create a picture with cmyk color, but the cmyk value displayed in photoshop is different! For example: the color set through ImagickPixel in ImageMagick is cmyk(0,0,0,100) (black), but when viewed with an eyedropper in photoshop, it becomes cmyk(61,61,61,0). It's obviously not black visually. Please help analyze the reason, thank you!

The code I tested is here: http://liudonghua.net/use-imagemagick-to-create-cmyk-image-in-php/

Someone on stackoverflow said that this is a bug of imagemagick. The solution provided is effective for simple colors, http://stackoverflow.com/questions/37981616/i-create-a-cmyk-image-by-php- imagemagick-but-cmyk-color-is-different-on-photosh

I reported this bug, friends in need can pay attention to it: https://bugs.php.net/bug.php?id=72481