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Ubuntu 19.04 has extra hidden gamma curve? (weird stuff…)

source.list empty in ubuntu 19.04Two GNOMEs in Ubuntu 19.04ubuntu 19.04 stops workingNextcloud on ubuntu server 19.04

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;

0

As soon as i loaded my test image i noticed the gradient was no longer smooth but it contained some vertical artifacts. I should point out that the gamma is set to default in Ubuntu: xgamma gamma 1.0

I also have Windblows 10 and OSX and there the gradient is smooth. However in Ubuntu it is brighter and contains vertical artifacts. And each time i take a screenshot, test image becomes brighter. This is driving me crazy.

So here is a test image:

Here is a screenshot from Ubuntu. Look into the black area and notice how an extra gamma is applied, reducing the amount of black compared to original. Also notice vertical artifact:

Notice how bright the image becomes after a couple of screenshots (a screenshot of a screenshot of a screenshot to be exact):

The test image in the last example has become stupidly bright indicating there is another layer of gamma control present in the display settings that is just hidden from access and is added to the previous gamma which was present in a screenshot.

Please keep in mind before you mention i should change gamma, this is all happening at gamma 1.0.

19.04 gamma

share|improve this question

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

add a comment
 | 

0

As soon as i loaded my test image i noticed the gradient was no longer smooth but it contained some vertical artifacts. I should point out that the gamma is set to default in Ubuntu: xgamma gamma 1.0

I also have Windblows 10 and OSX and there the gradient is smooth. However in Ubuntu it is brighter and contains vertical artifacts. And each time i take a screenshot, test image becomes brighter. This is driving me crazy.

So here is a test image:

Here is a screenshot from Ubuntu. Look into the black area and notice how an extra gamma is applied, reducing the amount of black compared to original. Also notice vertical artifact:

Notice how bright the image becomes after a couple of screenshots (a screenshot of a screenshot of a screenshot to be exact):

The test image in the last example has become stupidly bright indicating there is another layer of gamma control present in the display settings that is just hidden from access and is added to the previous gamma which was present in a screenshot.

Please keep in mind before you mention i should change gamma, this is all happening at gamma 1.0.

19.04 gamma

share|improve this question

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

add a comment
 | 

As soon as i loaded my test image i noticed the gradient was no longer smooth but it contained some vertical artifacts. I should point out that the gamma is set to default in Ubuntu: xgamma gamma 1.0

I also have Windblows 10 and OSX and there the gradient is smooth. However in Ubuntu it is brighter and contains vertical artifacts. And each time i take a screenshot, test image becomes brighter. This is driving me crazy.

So here is a test image:

Here is a screenshot from Ubuntu. Look into the black area and notice how an extra gamma is applied, reducing the amount of black compared to original. Also notice vertical artifact:

Notice how bright the image becomes after a couple of screenshots (a screenshot of a screenshot of a screenshot to be exact):

The test image in the last example has become stupidly bright indicating there is another layer of gamma control present in the display settings that is just hidden from access and is added to the previous gamma which was present in a screenshot.

Please keep in mind before you mention i should change gamma, this is all happening at gamma 1.0.

19.04 gamma

share|improve this question

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

share|improve this question

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

share|improve this question

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

edited Sep 30 at 16:58

Saxtheowl

3681010 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

asked Sep 29 at 22:17

dsolarisdsolaris

3355 bronze badges

1 Answer
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0

My Ubuntu 16.04 can display your windows screen captures without grey scale gradients (what you call "artifacts" in FireFox. It's not Ubuntu it's the program you are using to display the grey scale.

Try using Firefox or another image viewer instead of the one you are using now.

Note: My gamma is also set at 1.0 but after the sun sets it gradually goes more red and less blue and a little less green over a 120 minute period on two out of three monitors. Gamma has never effected grey scale gradients though on any of the monitors.

share|improve this answer

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am actually using Firefox. :) The problem is, every application in 19.04 shows this artifacts plus extra gamma applied which you can see in my Ubuntu screenshots. So i suspect some sort of a display correction is going on behind my back in Ubuntu 19.04. It comes cool as an eye relief, but for any serious graphical design the results can be catastrophic.
  
  – dsolaris
  Sep 30 at 14:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When i say every application that includes Firefox, XnView and ImageMagick.
  
  – dsolaris
  Sep 30 at 14:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @dsolaris There are "similar" but not identical gradient problems related to color changes. Basically it's 16-bit color depth selected instead of 24-bit or 32-bit color depth. But I'm kind of stumped on how to check the setting so far...
  
  – WinEunuuchs2Unix
  Oct 1 at 0:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  After much research I found this Arch Linux discussion which seems close to your problem: bbs.archlinux.org/viewtopic.php?id=225215
  
  – WinEunuuchs2Unix
  Oct 1 at 3:57
  

  
  
  
  

add a comment
 | 

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0

My Ubuntu 16.04 can display your windows screen captures without grey scale gradients (what you call "artifacts" in FireFox. It's not Ubuntu it's the program you are using to display the grey scale.

Try using Firefox or another image viewer instead of the one you are using now.

Note: My gamma is also set at 1.0 but after the sun sets it gradually goes more red and less blue and a little less green over a 120 minute period on two out of three monitors. Gamma has never effected grey scale gradients though on any of the monitors.

share|improve this answer

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am actually using Firefox. :) The problem is, every application in 19.04 shows this artifacts plus extra gamma applied which you can see in my Ubuntu screenshots. So i suspect some sort of a display correction is going on behind my back in Ubuntu 19.04. It comes cool as an eye relief, but for any serious graphical design the results can be catastrophic.
  
  – dsolaris
  Sep 30 at 14:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When i say every application that includes Firefox, XnView and ImageMagick.
  
  – dsolaris
  Sep 30 at 14:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @dsolaris There are "similar" but not identical gradient problems related to color changes. Basically it's 16-bit color depth selected instead of 24-bit or 32-bit color depth. But I'm kind of stumped on how to check the setting so far...
  
  – WinEunuuchs2Unix
  Oct 1 at 0:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  After much research I found this Arch Linux discussion which seems close to your problem: bbs.archlinux.org/viewtopic.php?id=225215
  
  – WinEunuuchs2Unix
  Oct 1 at 3:57
  

  
  
  
  

add a comment
 | 

0

My Ubuntu 16.04 can display your windows screen captures without grey scale gradients (what you call "artifacts" in FireFox. It's not Ubuntu it's the program you are using to display the grey scale.

Try using Firefox or another image viewer instead of the one you are using now.

Note: My gamma is also set at 1.0 but after the sun sets it gradually goes more red and less blue and a little less green over a 120 minute period on two out of three monitors. Gamma has never effected grey scale gradients though on any of the monitors.

share|improve this answer

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I am actually using Firefox. :) The problem is, every application in 19.04 shows this artifacts plus extra gamma applied which you can see in my Ubuntu screenshots. So i suspect some sort of a display correction is going on behind my back in Ubuntu 19.04. It comes cool as an eye relief, but for any serious graphical design the results can be catastrophic.
  
  – dsolaris
  Sep 30 at 14:23
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When i say every application that includes Firefox, XnView and ImageMagick.
  
  – dsolaris
  Sep 30 at 14:44
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @dsolaris There are "similar" but not identical gradient problems related to color changes. Basically it's 16-bit color depth selected instead of 24-bit or 32-bit color depth. But I'm kind of stumped on how to check the setting so far...
  
  – WinEunuuchs2Unix
  Oct 1 at 0:17
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  After much research I found this Arch Linux discussion which seems close to your problem: bbs.archlinux.org/viewtopic.php?id=225215
  
  – WinEunuuchs2Unix
  Oct 1 at 3:57
  

  
  
  
  

add a comment
 | 

My Ubuntu 16.04 can display your windows screen captures without grey scale gradients (what you call "artifacts" in FireFox. It's not Ubuntu it's the program you are using to display the grey scale.

Try using Firefox or another image viewer instead of the one you are using now.

Note: My gamma is also set at 1.0 but after the sun sets it gradually goes more red and less blue and a little less green over a 120 minute period on two out of three monitors. Gamma has never effected grey scale gradients though on any of the monitors.

share|improve this answer

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

share|improve this answer

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges

answered Sep 29 at 23:22

WinEunuuchs2UnixWinEunuuchs2Unix

66.5k1818 gold badges125125 silver badges246246 bronze badges