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Yellow on Quattro?

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Raist3d

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Seems like this shows the issue of chroma resolution loss

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sigma-rumors.com

Makes sense. Yellow needs red & green- precisely the main spectrum colors of the bottom layers that are 1/4th the resolution for the top. I looked on Flickr and saw a shot of a Banana that looks rather soft. But in that shot it's hard to tell if it was a photographic intent, or inherent look with current sensor/software.

The link from Sigma rumors though is pretty direct in showing chroma resolution loss. I would love if they took the same shot 6 months later after SPP goes a rev or two.
 
Raist3d said:
Seems like this shows the issue of chroma resolution loss

http://sigma-rumors.com/2014/07/sigma-dp2-quattro-yellow-on-blue-issue/

Makes sense. Yellow needs red & green- precisely the main spectrum colors of the bottom layers that are 1/4th the resolution for the top. I looked on Flickr and saw a shot of a Banana that looks rather soft. But in that shot it's hard to tell if it was a photographic intent, or inherent look with current sensor/software.
Click to expand...
I don't buy it at all, I mean that is makes sense to get this. From the photos I have done so far I don't see this chrome resolution loss. Have a look at the yellow flowers here: https://www.flickr.com/photos/prebenr/sets/72157645396604688/

Quattro has sharpenss: -0.8 and Merrill has sharpness: 0.0 in the two photos.

But that said, it can be a SPP artifact. I'll see if I can track down some yellow on blue :-) Ah the Sweeds must not like this, what do you say Roland ;-) Hmm, perhaps I can find plenty of yellow on blue at IKEA??? I'll check.
Member said:
The link from Sigma rumors though is pretty direct in showing chroma resolution loss. I would love if they took the same shot 6 months later after SPP goes a rev or two.
Click to expand...
Don't need to reshoot if there is no firmware changes and you have the RAW though.

OK, I'll test this with Q and Merrill.

--

Out lightwriting with Sigma
«Kaos»
 
Last edited:
PrebenR said:
Raist3d said:
Seems like this shows the issue of chroma resolution loss

http://sigma-rumors.com/2014/07/sigma-dp2-quattro-yellow-on-blue-issue/

Makes sense. Yellow needs red & green- precisely the main spectrum colors of the bottom layers that are 1/4th the resolution for the top. I looked on Flickr and saw a shot of a Banana that looks rather soft. But in that shot it's hard to tell if it was a photographic intent, or inherent look with current sensor/software.
Click to expand...
I don't buy it at all, I mean that is makes sense to get this.
Click to expand...
Why not? Again, it's 1/4th the resolution on two layers. Something's gotta give.
PrebenR said:
From the photos I have done so far I don't see this chrome resolution loss. Have a look at the yellow flowers here: https://www.flickr.com/photos/prebenr/sets/72157645396604688/
Click to expand...
Actually I a not seeing that much detail there.
PrebenR said:
Quattro has sharpenss: -0.8 and Merrill has sharpness: 0.0 in the two photos.

But that said, it can be a SPP artifact. I'll see if I can track down some yellow on blue :-) Ah the Sweeds must not like this, what do you say Roland ;-) Hmm, perhaps I can find plenty of yellow on blue at IKEA??? I'll check.
PrebenR said:
The link from Sigma rumors though is pretty direct in showing chroma resolution loss. I would love if they took the same shot 6 months later after SPP goes a rev or two.
Click to expand...
Don't need to reshoot if there is no firmware changes and you have the RAW though.

OK, I'll test this with Q and Merrill.
Click to expand...
Sounds like the issue (as the other post shows) may perhaps have to do with transitions of blue and colors requiring from the layers below. It's interesting.
PrebenR said:
--

Out lightwriting with Sigma
«Kaos»
Click to expand...
 
Hng said:
Another report of red on blue:

https://flic.kr/p/o3iswo

https://flic.kr/p/ojKQPA
Click to expand...
Maybe this shows what kind of strategy Sigma is doing. Just thinking about this now... It's also worth noting some areas of yellow in that shot do look detailed.

So perhaps the issue is- if SPP thinks there's a color like yellow around, it can make the blue layer pick detail from that spectrum of color, but if we go green or red (or both- yellow) next to blue, then it becomes critical to keep the detail (blue) layer to discern blue.

Anyway, just thinking out loud. Would be interesting to see what happens with colors like red on purple, etc.
 
There was a 100 post thread on this already:

Loading…

www.dpreview.com
 
Raist3d said:
Seems like this shows the issue of chroma resolution loss

http://sigma-rumors.com/2014/07/sigma-dp2-quattro-yellow-on-blue-issue/

Makes sense. Yellow needs red & green- precisely the main spectrum colors of the bottom layers that are 1/4th the resolution for the top. I looked on Flickr and saw a shot of a Banana that looks rather soft. But in that shot it's hard to tell if it was a photographic intent, or inherent look with current sensor/software.

The link from Sigma rumors though is pretty direct in showing chroma resolution loss. I would love if they took the same shot 6 months later after SPP goes a rev or two.
Click to expand...
What you see is a photo processed with an early SPP if I remember correctly. I saw it long time ago. It must be a NR issue as you can see the quattro photo has much more NR than the MErrill.

Here is my quick test today. I do not see any issues

100% crops of images. Please open in full size. The sign was far away that I could not read it with my eyes.
100% crops of images. Please open in full size. The sign was far away that I could not read it with my eyes.

100% crop of images. Shot a not so good poster through a glass door. Please open in full size.
100% crop of images. Shot a not so good poster through a glass door. Please open in full size.

--
Out lightwriting with Sigma
«Kaos»
 
Last edited:
Raist3d said:
PrebenR said:
Raist3d said:
Seems like this shows the issue of chroma resolution loss

http://sigma-rumors.com/2014/07/sigma-dp2-quattro-yellow-on-blue-issue/

Makes sense. Yellow needs red & green- precisely the main spectrum colors of the bottom layers that are 1/4th the resolution for the top. I looked on Flickr and saw a shot of a Banana that looks rather soft. But in that shot it's hard to tell if it was a photographic intent, or inherent look with current sensor/software.
Click to expand...
I don't buy it at all, I mean that is makes sense to get this.
Click to expand...
Why not? Again, it's 1/4th the resolution on two layers. Something's gotta give.
Click to expand...
Because you are talking about 2 pixels in the vertical plane, and the blur in these letters take more than 2 pixels. This is NR issue.
Member said:
Member said:
From the photos I have done so far I don't see this chrome resolution loss. Have a look at the yellow flowers here: https://www.flickr.com/photos/prebenr/sets/72157645396604688/
Click to expand...
Actually I a not seeing that much detail there.
Click to expand...
Open them up 100%.
Member said:
Member said:
Quattro has sharpenss: -0.8 and Merrill has sharpness: 0.0 in the two photos.

But that said, it can be a SPP artifact. I'll see if I can track down some yellow on blue :-) Ah the Sweeds must not like this, what do you say Roland ;-) Hmm, perhaps I can find plenty of yellow on blue at IKEA??? I'll check.
Member said:
The link from Sigma rumors though is pretty direct in showing chroma resolution loss. I would love if they took the same shot 6 months later after SPP goes a rev or two.
Click to expand...
Don't need to reshoot if there is no firmware changes and you have the RAW though.

OK, I'll test this with Q and Merrill.
Click to expand...
Sounds like the issue (as the other post shows) may perhaps have to do with transitions of blue and colors requiring from the layers below. It's interesting.
Click to expand...
Nope.
 
PrebenR said:
I don't see this chrome resolution loss. Have a look at the yellow flowers here: https://www.flickr.com/photos/prebenr/sets/72157645396604688/
Click to expand...
Seen that, but I have to say of all your Q-M comparisons this is the most questionable both for Q and M. Probably a focus issue but the details aren't exactly exciting. Also, that beer garden issue is specifically yellow on blue which is not the case for your flower pics.
PrebenR said:
But that said, it can be a SPP artifact.
Click to expand...
I so much hope so.
PrebenR said:
Hmm, perhaps I can find plenty of yellow on blue at IKEA??? I'll check.
Click to expand...
Yes please! You seem to have a light hand with Q. My hopes are on you.
 
dr.noise said:
PrebenR said:
I don't see this chrome resolution loss. Have a look at the yellow flowers here: https://www.flickr.com/photos/prebenr/sets/72157645396604688/
Click to expand...
Seen that, but I have to say of all your Q-M comparisons this is the most questionable both for Q and M. Probably a focus issue but the details aren't exactly exciting. Also, that beer garden issue is specifically yellow on blue which is not the case for your flower pics.
dr.noise said:
But that said, it can be a SPP artifact.
Click to expand...
I so much hope so.
dr.noise said:
Hmm, perhaps I can find plenty of yellow on blue at IKEA??? I'll check.
Click to expand...
Yes please! You seem to have a light hand with Q. My hopes are on you.
Click to expand...
Done. It is in this thread :-)
--
Out lightwriting with Sigma
<a href="
https://flic.kr/p/aPTr1K
" >«Kaos»</a>
 
[No message]
 
Thanks for posting the shots but I am not convinced we can reach the conclusion it's all good with them- at least yet.

The shots that were linked originally in the "Beer Garden" were not an issue of noise reduction- the Quattro shot looks reasonably sharp elsewhere. Ideally I would love to get hold of that RAW and try in the newest SPP as you mention it supposedly improved it.

And then there's also this (from maceQ- thanks!), which also shows an issue with the color resolution, as expected:

http://www.dpreview.com/forums/post/54035996

But my original title is off. It's not yellow by itself, but a specific combination.

--
Raist3d/Ricardo (Photographer, software dev.)- I photograph black cats in coal mines at night...
“The further a society drifts from truth the more it will hate those who speak it.” - George Orwell
 
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PrebenR said:
Here is my quick test today. I do not see any issues
Click to expand...
Yes me too. At least the issues aren't that big as to stop me from buying the Q.
 
About the second example with credit card logos.
There are fuzzy edges and very noticeable grain in both shots.
I believe it is not camera fuzziness and grain, but just printed texture being magnified?
 
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