Rendered clips get darker than previewed in VP 15.

michael-felhendler wrote on 1/3/2018, 8:09 AM

Looking at one and the same computer screen, rendered clips get darker than previewed in VP 15 (had the same problem in VP 14).

I have to compensate by adding "to much" brightness before rendering. Rendered format is Internet HD 1080p 25 or 50 fps. The grapics card on the computer is ASUS GeForce GTX 1060 6GB STRIX GAMING OC. Two LG W2220P screens are connected via HDMI.

Even though a broadcast monitor connected via an SDI-card would be preferred, shouldn't the amount brightness be more or less the same? Perhaps there are more parameters to be aware of in the rendering process?

Comments

Marco. wrote on 1/3/2018, 8:19 AM

Actually the luma RGB values are the same but different players decode differently.

NickHope wrote on 1/3/2018, 8:28 AM

This might help: https://www.vegascreativesoftware.info/us/forum/faq-why-does-my-video-have-more-contrast-than-the-vegas-preview--104567/

michael-felhendler wrote on 1/3/2018, 8:30 AM

Do you compare the preview and the rendered file inside Vegas or do you play the rendered file on a third party player/viewer?

I use the "Film & TV-app" in Win 10, maybe that's a bad choice? I haven't reflected on how different players decode, what should be my reference tool, any suggestions?

NickHope wrote on 1/3/2018, 10:00 AM

Do you compare the preview and the rendered file inside Vegas or do you play the rendered file on a third party player/viewer?

I use the "Film & TV-app" in Win 10, maybe that's a bad choice? I haven't reflected on how different players decode, what should be my reference tool, any suggestions?

I use VLC Player. MPC-HC is another good choice.

Just be aware that the contrast in the Vegas Preview window is intentionally less than a typical, rendered mp4 file played back correctly in a media player on a computer or on a TV, unless you apply corrective effects or use the Preview Levels extension in SeMW Extensions, as described in the link in my last comment.

To verify that you have your luminance settings correct in your media player and graphics card settings, you can render an AVC MP4 file from this chart, pause the rendered video in your media player, and sample the colors with Just Color Picker or similar app. Ensure that the RGB figures it measures correspond (within plus or minus 1) to the numbers in the original PNG file. If the numbers match and your videos play OK in the "Film & TV app" then there's nothing inherently wrong with using it.