Change in Gamma?

Hi, i have a Sanyo Xacti VPC-HD1000. i also noticed this problem with a previous video camera i had too.
basically, when i watch videos on the camera screen there appears to be more detail than when i import them onto the computer.
i've always assumed it's a gamma issue and just adjusted the gamma on dark clips in final cut. but i am not looking at an image on the camera and on my screen. on the camera screen you can see whites in the eyes, but on the computer, even if i adjusted the gamma all the way to the extreme the eyes are still black.
can anyone help? it's not the end of the world or anything, but if the information is on the camera screen then it must be there, but i just need to use some other filter other than gamma to extract it.
cheers

Shane's Stock Answer #2: Low Quality/Blurry playback
ONLY JUDGE THE QUALITY OF YOUR MATERIAL ON AN EXTERNAL BROADCAST MONITOR, OR AT LEAST A TV.
The Canvas shows you what happens after the codec you are working with has been applied. The Viewer shows you the material in its native format. Once you drop the footage from the Viewer into the timeline, it inherits the attributes of the sequence. If it is a DV sequence, the footage will render out as DV.
1. Disable overlays on the Canvas.
2. Make sure you've rendered everything (no green bars at the top of the timeline).
Video playback requires large amounts of data and many computations. In order to maintain frame rate and be viewable at a normal size, only about one-fourth of the DV data is used in displaying the movie to the screen. However, the DV footage is still at full quality, and is best viewed thru a TV or broadcast monitor routed thru your camera or deck.
Shane

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How to change document gamma (or create a "false profile")

Although there has been much recent criticism of the notion of "false profiles," generally associated with the person who espouses it, I would like to be able to convert a document which is in, e.g., Adobe RGB with a gamma of 2.2 to one of the same colorspace but a gamma of, say, 1.5. Although I can do this via the color settings dialogue, creating a new setting with the name, e.g., "gamma 1.5," and although at the time of creation of the new setting the document does indeed become lighter, nonetheless the setting does not "stick." That is, if I leave that document and later try to apply that same setting via edit>convert to profile, nothing happens. I'd greatly appreciate someone giving me some pointers on how to establish a setting such that it appears and is functional in the edit>convert to profile list. I'm working in CS2 in OS10.5.6. Many thanks

retiredpatman wrote:
I would like to be able to convert a document which is in, e.g., Adobe RGB with a gamma of 2.2 to one of the same colorspace but a gamma of, say, 1.5.
The Red, Green and Blue tone response curves are kept separately in the .icm file. You can see that if you open an .icm file in Apple's ColorSync Utility.app. In the case of AdobeRGB1998.icm you'll find that each of those curves has an identical Gamma of 2.199, but they're stored and display separately.
You would need access to a profile generating application to change that, and you'd need to know what you're doing.

How do you change default gamma assigned to new displays

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Thank you,
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In System Prefernces > Displays > Calibrate. Make sure that the desired display is attached then follow through the options. Be sure to click on "Expert Mode" in the bottom left of that window.

How do I change my gamma to 2.2

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I've done the first 2 things, but how do I set my gamma to 2.2?

Okay, so I went to the colour tab, I selected sRGB Profile, I clicked calibrate, and from there I selected 2.2 Television Gamma and then Native for the white spot. Saved as iMac Calibrated.
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AE changes the gamma level of DVCPRO HD 1080p files

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Enemy Territory: gamma change impossible with fglrx 8.42.3-1

After the last fglrx update I am unable to change my gamma in Enemy Territory. It just stays very dark. I heard that other people have the same problem (German ubuntu (:p) forums: http://forum.ubuntuusers.de/topic/130081/#1046848).
Now I tried to downgrade but then the older fglrx are incompatible with the current xorg, that gave me some evil error messages. Do I have to downgrade xorg as well now, if I want a brighter ET or is there a workaround?

I thin you could simply open a console and type
xgamma -gamma foo
(where foo is a float; 1.0 is default, > 1.0 is brighter, < 1.0 is darker)
Last edited by FizDev (2007-11-20 03:29:49)

Gamma or contrast changes

Hi, I am trying to change gamma correction (or brightness, or contrast) ON-THE-FLY as I encounter different pictures in IE9 .. I guess this would be a plugin, something that would not change the gamma or contrast for the monitor. I think I have encountered this once on a computer where the LEFT-BUTTON of the mouse was pressed and then dragged through a range of gamma.
Is there such a thing? What is this dynamic dragging through gamma or contrast called? "windowing?" THANK YOU VERY MUCH.

This can be caused by a problem with the color profile for your display monitor or color profiles embedded in images.<br />
You can disable color management to test that.<br />
You can set the pref gfx.color_management.mode to 0 on the about:config page to disable Color Management.<br />
You need to close and restart Firefox to make the change effective.<br />
See:
* http://kb.mozillazine.org/gfx.color_management.mode
See also:
* https://developer.mozilla.org/En/ICC_color_correction_in_Firefox

Gamma changed in snow leopard

My pictures all look darker with the installation of Snow Leopard. Is there an operation that I can do to thousands of pictures as a batch, that will lighten them back to what they used to look like on screen?

Snow Leopard changed the monitor's gamma from 1.8 to 2.2. You can use the System/Display preference pane to recalibrate the screen and change the gamma setting back to 1.8.

Quick Time 8 Gamma has changed when opening H.264 files.

I noticed yesterday that the same move file from my Canon 5DMK2 shows a different gamma than when opened in QT7.
I have the optional QT7 installed and opening the file side by sides shows the difference, crushed blacks and burnt highlights.
Once exported the colour data is lost. QT8 only saves in H.264, so if using the share function in QT8 your file will have this problem.
(QT7 - Enable Final Cut Studio color compatibility, checked) no option in QT8.

My understanding is that Snow Leopard uses a new standard gamma of 2.2. Previously, the standard gamma for Mac OS X was 1.8. Page 4 of this excellent but extensive Snow Leopard review has a good explanation.
http://arstechnica.com/apple/reviews/2009/08/mac-os-x-10-6.ars/4
Perhaps this change accounts for what you observed. If so, you can use Calibrate tool in System Preferences Displays pane Color tab to change the gamma setting to 1.8.

Changing gamma value using AS3

In one of my project requirement, i want to change the brightness,contrast ,hue,saturation and gamma value of an image.. now i got a class in AS3 for changing all properties except that of the gamma value.. is it possible to change the gamma value of an image using AS3?

yep!!
// Load an image onto the Stage.
var loader:Loader = new Loader();
var url:URLRequest = new URLRequest("http://www.helpexamples.com/flash/
images/image1.jpg");
loader.load(url);
this.addChild(loader);
function applyFilter(event:MouseEvent):void
// Create the convolution matrix.
var matrix:Array = [ 0, 0, 0,
0, 0, 1,
0, 0, 0 ];
var convolution:ConvolutionFilter = new ConvolutionFilter();
convolution.matrixX = 3;
convolution.matrixY = 3;
convolution.matrix = matrix;
convolution.divisor = 1;
loader.filters = [convolution];
loader.addEventListener(MouseEvent.CLICK, applyFilter);

The gamma doesn't change. At all. How do I fix this?

I had this issue on my old white MacBook, and used Migration Assistant to move everything over to my MacBook Pro. Seems this gamma issue migrated with it.
Whenever I change the gamma, it stays for a fraction of a second before snapping back to normal. This happens whether I use the display calibrator assistant or a gamma option in other programs. The slider doesn't snap back though. Just the screen's gamma itself.
Does anyone have any solutions or things to try?

Hello noun_verber
Try and see if you can replicate the issue in another user on your MacBook Pro. Check out the articles below on how to do that as well as what to do if it is just your user.
Mac OS X: How to troubleshoot a software issue
http://support.apple.com/kb/ht1199
Isolating an issue by using another user account
http://support.apple.com/kb/TS4053
Regards,
-Norm G.

Test results showing how FCP7 running on 10.6 messes with gamma

I've been running some simple tests to determine how FCP7 handles gamma when running 10.6.4.
Note that 10.6.4 now uses a gamma of 2.2 natively (as do PCs).
I created three images in targa, png and tif (also tried exr, but FCP won't read that) that contained squares colored in different shades of gray, solid colors and mixed colors.
This download link is good for 7 days:
https://www.yousendit.com/directDownload?phi_action=app/directDownload&fl=SWhZek ZpTk1IcWR1a29CcFA0aU9SMHVDeVNFRkF0Qm1kRmM2aXU1dg
When I brought these into FCP, the results were not good.
FCP changed the gamma considerably on them, so that all the colors were WAY off (127,127,127 became 145,145,145)
I was able to ALMOST fix this by applying a gamma filter (NOT the gamma correction filter, totally different) with a value of .82.
Now, in a 0.255 scale, my values were only off by one.
However, that is a massive color shift for anyone dealing with color management.
1. Is there a way to bring in an image sequence so that FCP does NOT tamper with the gamma?
2. If I must gamma correct, is there a 3rd party plug-in with more significant digits? I need more digits than .82.
I also did some testing on Quicktime.
QT10 is a total mess. When I output to a non-self-contained mov (after gamma correcting), it was WAY off.
QT7 is on the mark and matches what VLC shows.
The same goes for outputting to H.264. QT7 = good, QT10 = BAD.
I suppose I'll experiment with Compressor now to see the proper values to get ALMOST back to my original colors.
Hopefully I'm missing some hidden setting for 'give me back my original gamma'.
BTW - you can open the images I supplied in Photoshop to see the correct values.
Using the 'digital color meter' included with 10.6 is a quick way to determine the RGB values that are displayed on the screen in FCP, QT and other programs.
And a value of 127,127,127 is just an absolute value, doesn't really matter if you have a $10K reference monitor to display it on (although, I'm sure the same RGB values would look different on the reference monitor).
BTW, FCP7 and 10.5 also mess with gamma.

As I had such dismal results with getting h.264 from FCP7/Compressor to match my input colors when viewed in VLC and the Quicktime player, I decided to try using Premiere CS4.
Both Premiere CS4/AME and FCP7/Compressor produced h.264 that was pretty far off when viewed in VLC and the Quicktime player7, although CS4/AME was a bit closer.
As my final output is often intended for the web, I decided to try the same files when displayed using the latest Flash player.
The results were interesting.
The Premiere CS4 results were all within 1 value of being correct. 127,127,127 would end up as 126,126,126 - and the same for the other shades of grey and color combinations.
But the FCP7/Compressor display was a disaster. 63,63,63 displayed as 81,81,81.
127,127,127 displayed as 144,144,144.
So, at least for Flash viewing of videos on the web, FCP/Compressor just couldn't produce accurate colors, they were all WAY off.
I'll have to try the same tests for DVD and BluRay.
BTW - this is the very simple image I used for testing (this display is a png, I used a tga for the actual tests to eliminate any possibility of a color profile getting embedded by mistake).
http://i34.tinypic.com/29lbgo7.png
This link with the original files is valid until aug 12:
https://www.yousendit.com/directDownload?phi_action=app/directDownload&fl=SWhZek ZpTk1IcWR1a29CcFA0aU9SMHVDeVNFRkF0Qm1kRmM2aXU1dg

My screen is in gamma display, how do i turn it back to normal colors?

My screen has changed to gamma mode. How do i change it back to display colors normlly?

Yes, you probably have the tripple-click Home button option off.
Just visit the Accessibility pane under General settings (as described by King_Penguin above) and choose to assign what you need for your tripple click command, in this case toggling the black & white option.
You can also tell it to 'ask' you what you want from that command each time.
Hope this helps.

Interface/Gamma issue - Display profiling

If you profile/calibrate your display (with professional software) to Gamma L* - darkish, grey boxes appear in some application-windows. Never happend in Tiger so I figure it's a Leopard issue.*
If you use Gamma 1.8, the Apple default, Photoshops windows (in my case) look perfekt. With Gamma 2.2 they're barely noticable (pretty much only if you know the boxes are there).
All the other settings you can choose while profiling - like temperature, luminance, chromatic adaption, profile-type etc. don't influence windows in this way - but as soon as you change the gamma those boxes appear.
I would very much like to know how you guys deal with it - do you profile your display to 1.8/2.2 (like a CRT) OR do you use L* and live with the boxes OR have you profiled your display properly/with L* but you don't have this nuisance? (!?)
Any help/info would be greatly appreciated.

*So here's what I think happens (+ my idea to solve the grey-boxes issue):*
Some applications use the monitor-profile to draw their interface. Like Photoshop and Graphic Converter. (The only 2 I've installed, I'm sure some video-editing-applications, even players are concerned that's maybe the reason some people think it's 'random'). I think these apps do so to immediately can reflect a change in the profile, without restart.
Now Mac OS X Leopard seems to not allow these applications to do so in certain parts of the interface. (Must be new, that's why there were no issues with Tiger) The window itself is drawn by the OS. That's the reason only elements like the text and buttons are affected.
And the problem is that the OS uses its 'Generic RGB Profile.icc' which contains Gamma 1.8. So if you calibrate your display with Gamma L* (which you really should do and most profiling-software does by default) those grey boxes appear in said applications.
The solution is easy. Replace the system-rgb-profile with one that supports L* - like the eciRGB profiles.
To do so you have to rename the .icc file in finder but also edit the information inside (which can be done with the ColorSync Utility). Then copy it to the System/Library/ColorSync/Profiles folder.
*After that the grey boxes dissapear and everything is back to normal.* There's some difference in the tabular data like the CMM and a chroma-entry, so you might want to re-write your display-profile just to make sure everything's alright.
I haven't seen anything yet but could imagine that the rendering of webpages in safari might be affected. Or rather some webbrowsers' without colour management. (Just a theory, hopefully not...)
*Problem 1:*
Some Adobe apps can see that the current system-profile is identical to your working-space-rgb and reset your rgb-choice to the Generic RGB profile after a restart. (Without changing the 'Colormanagement SYNC'd icon/setting.) This probably could cause trouble if you export or open files.
Solution:
Use a different profile for your system than your Adobe-RGB setting. I used the 'L-Star RGB v2' for the system and the 'eciRGB v2' for Adobe. They're technically identical but for some reason Photoshop and esp. Illustrator now respect my choices and don't reset anything. Works fine for me.
*Problem 2:*
Besides the aforementioned chroma-entry in the Apple default profile (which loss shouldn't cause any issues) there's also the localisation information. Because the profile is named differently in different languages of OS X. I haven't found anything causing trouble (probably because if the profile isn't found it resets back to the english version by default).
Solution:
This would be easy if someone knows about a .icc file editor. If we could add those localised names from the Apple profile no application would ever know. I've only found hexadecimal editors but won't put something like that on my machine, especially since everything works fine.
*I hope Apple comes up with a real solution soon, this seems like too much of a hack - considering the delicate nature of colour management.*
*If you read this and know what I'm talking about and disagree or know any reasons why one would not want to do this - please speak up! I'm sure I'm not the only one who would like to know.*
This is pretty much mirrored on the Adobe forums btw.

Leopard - CS3 - Interface/Gamma issue

Hello there, switched to 10.5(.4) on a MacPro today and now check this out, it's only in Photoshop. Illy and Indesign and Bridge are fine. No other applications are affected.
If you profile/calibrate your display (with professional software) to Gamma L* - darkish, grey boxes appear in the Photoshop dialogue windows.
http://img297.imageshack.us/my.php?image=leopardphotoshop11zg0.png
If you use Gamma 1.8, the Apple default, Photoshop looks perfekt. With Gamma 2.2 they're barely noticable (pretty much only if you know they're there).
All the other settings you can choose like temperature, luminance, chromatic adaption, profile-type etc. don't influence Photoshop-windows in this way - but as soon as you change the gamma those boxes appear.
I would very much like to know how you guys deal with it - do you profile your display to 1.8/2.2 OR do you use L* and live with the boxes OR have you profiled your display properly but you don't have this nuisance? (!?)
Any help/info would be greatly appreciated.

b So here's what I think happens (+ my idea to solve the grey-boxes issue):
Some applications use the monitor-profile to draw their interface. Like Photoshop and Graphic Converter. (The only 2 I've installed, I'm sure some video-editing-applications, even players are concerned that's maybe the reason some people think it's 'random'). I think these apps do so to immediately can reflect a change in the profile, without restart.
Now Mac OS X Leopard seems to not allow these applications to do so in certain parts of the interface. (Must be a new feature!) The window itself is drawn by the OS. That's the reason only elements like the text and buttons are affected.
And the problem is that the OS uses its 'Generic RGB Profile.icc' which contains Gamma 1.8. So if you calibrate your display with Gamma L* (which you really should do and most profiling-software does by default) those grey boxes appear in said applications.
The solution is easy. Replace the system-rgb-profile with one that supports L* - like the eciRGB profiles.
To do so you have to rename the .icc file in finder but also edit the information inside (which can be done with the ColorSync Utility). Then copy it to the System/Library/ColorSync/Profiles folder.
After that the grey boxes dissapear and everything is back to normal. There's some difference in the tabular data like the CMM and a chroma-entry, so you might want to re-write your display-profile just to make sure everything's alright.
I haven't seen anything yet but could imagine that the rendering of webpages in safari might be affected. Or rather some webbrowsers' without colour management. (I'm just guessing.)
b Problem 1:
Some Adobe apps can see that the current system-profile is identical to your working-space-rgb and reset your rgb-choice to the Generic RGB profile after a restart. (Without changing the 'Colormanagement SYNC'd icon/setting.) This probably could cause trouble if you export or open files.
b Solution:
Use a different profile for your system than your Adobe-RGB setting. I used the 'L-Star RGB v2' for the system and the 'eciRGB v2' for Adobe. They're technically identical but for some reason Photoshop and esp. Illustrator now respect my choices and don't reset anything. Works fine for me. (!)
b Problem 2:
Besides the aforementioned chroma-entry in the Apple default profile (which loss shouldn't cause any issues) there's also the localisation information. Because the profile is named differently in different languages of OS X. I haven't found anything causing trouble (probably because if the profile isn't found it resets back to the english version by default).
b Solution:
This would be easy if someone knows about a .icc file editor. If we could add those localised names from the Apple profile no application would ever know. I've only found hexadecimal editors but won't put something like that on my machine, especially since everything works fine.
I hope Apple comes up with a real solution soon, this seems like too much of a hack - considered the delicate nature of colour management.
If you read this and know what I'm talking about and disagree or know any reasons why one would not want to do this - please speak up! I'm sure I'm not the only one who would like to know.

Change in Gamma?

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