Post SSM Iray settings

hobhobuk

I wondered what these were for?  Had not noticed them before until the recent BETA? Or I just hadn't noticed..

There is Post SSM enable and Post SSM target.

Anyone know what this means?  Thanks :)

Richard Haseltine

hobhobuk said:

I wondered what these were for?  Had not noticed them before until the recent BETA? Or I just hadn't noticed..

There is Post SSM enable and Post SSM target.

Anyone know what this means?  Thanks :)

They are new in this beta, see the third bullet point under NVIDIA Iray here https://www.daz3d.com/forums/discussion/comment/5534391/#Comment_5534391

hobhobuk

Ace, thanks for the link :)

Rev2019

still only fancy letters with no real information

what [on Earth] does it do in reality?

any before and after images?

Btw the word is SSIM not SSM

Richard Haseltine

Rev2019 said:

still only fancy letters with no real information

what [on Earth] does it do in reality?

any before and after images?

Btw the word is SSIM not SSM

It provides an alternative way of estimating how nearly "done" a render is.

Rev2019

Richard Haseltine said:

Rev2019 said:

still only fancy letters with no real information

what [on Earth] does it do in reality?

any before and after images?

Btw the word is SSIM not SSM

It provides an alternative way of estimating how nearly "done" a render is.

LOL

i think my eyes do an better job of that already ;)

Conclusion: wasted RAM usage for nothing if you have working eyes that is

Richard Haseltine

Your eyes can't really guess at how much renderer-work the remainder requires, though.

emotionaldreams2

hmm i find it useless. so i keep it disabled 

 

nonesuch00

It does seem to speed up my renders but I CPU render and the iteration cutoff is a comparitively low 3000 at 95% render quality convergence, render quality at 1 and SSIM at 98%.

williamaldensmith

No one in this thread explained what this does. At all.

AgitatedRiot

williamaldensmith said:

No one in this thread explained what this does. At all.

This will answer your question. What is Post SSIM - Daz 3D Forums 

Or Making sense of VMAF, SSIM, and PSNR video quality metrics (visionular.com)

SSIM (Structural Similarity Index Measure)

SSIM is a full-reference image quality evaluation index that measures image similarity from brightness, contrast, and structure. The value range of SSIM is [0,1], where the more significant the value, the smaller the image distortion. SSIM gets compared to other metrics, including PSNR, MSE, and other perceptual image and video quality metrics. In testing, SSIM often outperforms MSE-based standards.

SSIM is an excellent choice for applications like:

• estimation of content-dependent distortion,
• capturing and measuring the impact of noise,
• capturing blurring artifacts.

SSIM is unique in its ability to measure the subjective loss of coding. For example, when encoding using x264 with SSIM and AQ (adaptive quantization technology) turned off, x264 will use a lower bit rate for smooth areas containing minor detail. AQ better allocates the bit rate to each macroblock. As a result, PSNR and VMAF incorrectly score the quality, whereas SSIM correlates better with personal viewing.

What is probably clear by now is that there is no single “winning” quality metric, and even with SSIM’s positive attributes, there are specific applications where the metric may fail, such as:

• assessing the quality of Super-Resolution algorithms,
• detecting and capturing spatial and rotational shifts,
• capturing changes in brightness, contrast, hue, and saturation.

spicefiction

AgitatedRiot said:

williamaldensmith said:

No one in this thread explained what this does. At all.

This will answer your question. What is Post SSIM - Daz 3D Forums 

That thread links back to this one.