Re: Convert jpg with quality not properly

I am comfused about the quality,  if the quality not store into Image Structure, why I use GraphicsMagick utils convert jpeg, but get the right quality when checked it. And there is some regulars for the quality when use the binding:

Expect Quality     Real Quality
70		   		34
80				50
88				70
90				76
91				78
92				80

Actually, I try another golang binding for testing, but get the same problem. But, I use ImageMagick to view the verbose, I notice that：Quality: 34 (approximate). As you said before, maybe there is no perperty for the quality.



> 在 2018年9月15日，下午9:47，Bob Friesenhahn <[email protected]> 写道：
> 
> On Sat, 15 Sep 2018, YongdeGe wrote:
> 
>> Thank you for your reply.
>> 
>> The golang binding (https://github.com/rainycape/magick) was not maintained for at least four years, and the binding use MagickCore api, and it call low api ImageToBlob with info{quality, format}.
> 
> I should mention that GraphicsMagick only stores quality in the ImageInfo structure so that it is only used when writing the image and is not an image property.  In the future it may also store it in the Image structure (as an image property).  I would not be surprised if ImageMagick has added a quality member to its Image structure.
> 
> Bob
> -- 
> Bob Friesenhahn
> [email protected], http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/
> 
> 
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