cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Canon DPP software "sharpness" vs. "unsharp mask", question for DPP support

johnrmoyer
Whiz
Whiz

I have a good understanding of unsharp mask going back to my Uncle explaining to me in the 1960s how he did it using enlargers. I have knowledge of some other algorithms as a result of reading IEEE Computer Graphics and ACM Siggraph journals some decades ago, but have not kept up with what has been done recently.

Does the "sharpness" setting in DPP use an unsharp mask but set the parameters automatically or does it use another algorithm. If it uses a convolution kernel, then why would not both sharpness and unsharp mask be available for the same image.

https://cam.start.canon/en/S002/manual/html/UG-04_EditImage_0040.html#EditImage_0050_15

https://en.wikipedia.org/wiki/Unsharp_masking

A "sharpen" convolution kernel might be adjusted by only changing a single parameter the magnitude of the central point, but the size of the kernel might also be adjusted. The sharpen kernel mentioned by https://en.wikipedia.org/wiki/Kernel_(image_processing)  will increase contrast at edges, but could be done together with unsharp mask.

It has seemed to me from comments in other forums that many camera users have little knowledge of image sharpening algorithms. I have only noticed the unsharp mask algorithm mentioned by name in DPP, but one might guess that diffraction blur correction uses Richardson/Lucy deconvolution or something similar and sets the parameters automatically. Diffraction correction is also included in digital lens optimizer as evidence for my guess.

Mentioning the algorithms by name in the DPP manual would enable users to look them up and make better decisions about parameters and amounts. It might also dispel some wrong information about what DPP does.

 

1 ACCEPTED SOLUTION

Hazel_T
Product Expert
Product Expert

Hi johnrmoyer,

The specific code used for DPP uses for settings like sharpening is not information available to the public. The only information available to the public about how the settings work is in the software manual. Information on using the tool palette settings is available HERE.

We appreciate feedback on changes customers would like us to make to our manuals and products. We have a team that documents and handles customer feedback. I have already alerted them to this post, but if you want to contact them directly in the future they can be reached by going to our website HERE and selecting Feedback in the top right corner of the site. We do take customer suggestions and feedback into consideration when we are updating our products and processes.

View solution in original post

1 REPLY 1

Hazel_T
Product Expert
Product Expert

Hi johnrmoyer,

The specific code used for DPP uses for settings like sharpening is not information available to the public. The only information available to the public about how the settings work is in the software manual. Information on using the tool palette settings is available HERE.

We appreciate feedback on changes customers would like us to make to our manuals and products. We have a team that documents and handles customer feedback. I have already alerted them to this post, but if you want to contact them directly in the future they can be reached by going to our website HERE and selecting Feedback in the top right corner of the site. We do take customer suggestions and feedback into consideration when we are updating our products and processes.

Avatar
Announcements