video too dark when editing at DVinfo.net

Soren Hiorth · March 2nd, 2007, 09:13 AM

hi

I cant find a thread on this topic anywhere in the forum, but some of you guys must have experienced this before?

When I edit in any application such as premiere pro, avid liquid etc the gamma on my video-files is simply too low, and pictures appear way too dark on screen. If I preview the files in media player, they look fine, but as soon as i open the files in the edit-application, I guess the gamma-screen-setting are set aside somehow?? Can I somehow change the meta-data in my videofiles, so that the program understands how to handle the files?

Thanks

Søren

Glenn Chan · March 2nd, 2007, 02:08 PM

Media Player has its own image controls. Or rather, the video overlay controls change what you see in Media Player but not in Premiere. That may or may not be it.

To see if this is the case, go into the settings for your video card and make sure the video overlay settings are neutral.

2- Another thing you could do is to look at your image on the histogram in your NLE. If there is a nice distribution of levels, then your original footage is good. If not, then there might be some sort of levels conversion problem (i.e. studio RGB 16-235 versus computer RGB 0-255; this behaviour is determined by the codecs you use; try to use the default codecs).

Soren Hiorth · March 4th, 2007, 04:59 PM

hi glenn

Thanks for helping.

My gamma settings on my video-cards are set to 1.70 which is not neutral. Default is 1.00. Only with this setting the files are shown correctly in mediaplayer.

If I put the files back on tape, they appear fine during playback on the camera. It seems that levels are distributed correctly.

I've uninstalled all codecs, so that I have only have standard codecs installed. Still the same.

Tell me more on the "studio RGB 16-235 versus computer RGB 0-255"-thing...

Søren

John Miller · March 4th, 2007, 05:08 PM

The gamma settings for the video overlay only affect video that is being written directly to the hardware. Under Windows, typically only one window can use the hardware overlay, other windows have to use the more traditional method of "painting" to the window.

Most likely, Premiere isn't able to use the hardware overlay - either because it is in use by another program or another window in Premiere.

A quick way to determine if the overlay is being used or not is to drag the entire window around the screen. When the overlay is being used, there is a noticeable lag. Or you can press the PrtSc button to copy the desktop to the clipboard and then paste it into a suitable program (like MS Paint). If the overlay is being used, the bitmap of the desktop will show either a black rectangle where the video should be or, if the video is still being shown by the other program, you'll see parts of it on the bitmap. (Best thing is to close the video application after pressing PrtSc to avoid confusion).

Soren Hiorth · March 4th, 2007, 05:19 PM

hi glenn

Thanks for helping.

My gamma settings on my video-cards are set to 1.70 which is not neutral. Default is 1.00. Only with this setting the files are shown correctly in mediaplayer.

If I put the files back on tape, they appear fine during playback on the camera. It seems that levels are distributed correctly.

I've uninstalled all codecs, so that I have only have standard codecs installed. Still the same.

Tell me more on the "studio RGB 16-235 versus computer RGB 0-255"-thing...

Søren

Glenn Chan · March 6th, 2007, 12:45 AM

The gamma setting on your video card is likely the problem?? It probably should be 1.00.

March 2nd, 2007, 09:13 AM	#1
Soren Hiorth New Boot Join Date: Feb 2007 Location: Copenhagen, Denmark Posts: 5	video too dark when editing hi I cant find a thread on this topic anywhere in the forum, but some of you guys must have experienced this before? When I edit in any application such as premiere pro, avid liquid etc the gamma on my video-files is simply too low, and pictures appear way too dark on screen. If I preview the files in media player, they look fine, but as soon as i open the files in the edit-application, I guess the gamma-screen-setting are set aside somehow?? Can I somehow change the meta-data in my videofiles, so that the program understands how to handle the files? Thanks Søren

March 2nd, 2007, 02:08 PM	#2
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	Media Player has its own image controls. Or rather, the video overlay controls change what you see in Media Player but not in Premiere. That may or may not be it. To see if this is the case, go into the settings for your video card and make sure the video overlay settings are neutral. 2- Another thing you could do is to look at your image on the histogram in your NLE. If there is a nice distribution of levels, then your original footage is good. If not, then there might be some sort of levels conversion problem (i.e. studio RGB 16-235 versus computer RGB 0-255; this behaviour is determined by the codecs you use; try to use the default codecs).

March 4th, 2007, 04:59 PM	#3
Soren Hiorth New Boot Join Date: Feb 2007 Location: Copenhagen, Denmark Posts: 5	hi glenn Thanks for helping. My gamma settings on my video-cards are set to 1.70 which is not neutral. Default is 1.00. Only with this setting the files are shown correctly in mediaplayer. If I put the files back on tape, they appear fine during playback on the camera. It seems that levels are distributed correctly. I've uninstalled all codecs, so that I have only have standard codecs installed. Still the same. Tell me more on the "studio RGB 16-235 versus computer RGB 0-255"-thing... Søren

March 4th, 2007, 05:08 PM	#4
John Miller Major Player Join Date: Oct 2005 Location: Hillsborough, NC, USA Posts: 968	The gamma settings for the video overlay only affect video that is being written directly to the hardware. Under Windows, typically only one window can use the hardware overlay, other windows have to use the more traditional method of "painting" to the window. Most likely, Premiere isn't able to use the hardware overlay - either because it is in use by another program or another window in Premiere. A quick way to determine if the overlay is being used or not is to drag the entire window around the screen. When the overlay is being used, there is a noticeable lag. Or you can press the PrtSc button to copy the desktop to the clipboard and then paste it into a suitable program (like MS Paint). If the overlay is being used, the bitmap of the desktop will show either a black rectangle where the video should be or, if the video is still being shown by the other program, you'll see parts of it on the bitmap. (Best thing is to close the video application after pressing PrtSc to avoid confusion).

March 4th, 2007, 05:19 PM	#5
Soren Hiorth New Boot Join Date: Feb 2007 Location: Copenhagen, Denmark Posts: 5	hi glenn Thanks for helping. My gamma settings on my video-cards are set to 1.70 which is not neutral. Default is 1.00. Only with this setting the files are shown correctly in mediaplayer. If I put the files back on tape, they appear fine during playback on the camera. It seems that levels are distributed correctly. I've uninstalled all codecs, so that I have only have standard codecs installed. Still the same. Tell me more on the "studio RGB 16-235 versus computer RGB 0-255"-thing... Søren

March 6th, 2007, 12:45 AM	#6
Glenn Chan Inner Circle Join Date: Jun 2003 Location: Toronto, Canada Posts: 4,750	The gamma setting on your video card is likely the problem?? It probably should be 1.00.