Blackmagic and PhotoJpeg luma shifts…Anyone?

[Kristian Lam]

Hi Mactrix,

Can you please contact us at support[at]blackmagic-design.com?

regards

Kristian
Blackmagic Design

[Mactrix]

My colleague did. He also sent screenshots.
The vertical lines and color errors seems so be fixed
in After Effects 7 which we could test yesterday.
Also the image isn’t darker anymore in After Effects 7
when working in 16-Bit …

[Michael Becker]

hi mike!

had the same problem with bright images in pause and darker images in play. this occured about 3 weeks ago without me doing any changes to my system.
yesterday i deleted the FCP preference files and that solved the problem. i wonder how long it will last this time.

got another problem with photo jpeg 100%: my images are displayed brighter in after effects, than they are in FCP or on the source tape. on my waveform monitor it looks like a slight gamma-change.
curious about that: it only appears on our two systems with os 10.4.3, FCP 5.0.3 and QT 7.0.3. on our system with os 10.3.8, FCP 4.5 and QT 6.5.2 everything is fine.

anybody got an explanation for that?

thanx, zealander.

[Michael Becker]

hi mike!

had the same problem with bright images in pause and darker images in play. this occured about 3 weeks ago without me doing any changes to my system.
yesterday i deleted the FCP preference files and that solved the problem. i wonder how long it will last this time.

got another problem with photo jpeg 100%: my images are displayed brighter in after effects, than they are in FCP or on the source tape. on my waveform monitor it looks like a slight gamma-change.
curious about that: it only appears on our two systems with os 10.4.3, FCP 5.0.3 and QT 7.0.3. on our system with os 10.3.8, FCP 4.5 and QT 6.5.2 everything is fine.

anybody got an explanation for that?

thanx, zealander.

[Sam Goetz]

I’m ALSO getting PhotoJpeg luma shifts when converting blackmagic 10-bit into photo-jpeg 100%.

Check this out:

When I capture a 10-bit blackmagic file the luma is perfect, but when I …

… convert to photo-jpeg 100% using quicktime, the image is darker
… convert to photo-jpeg 100% using cleaner, the image is darker
… convert to motion jpeg a or b 100% using quicktime, the image is daker
… convert to photo-jpeg 100% using final cut pro (quicktime conversion, not off a sequence just a straight clip conversion), the image is PERFECT! SAME LUMA!
… if I CAPTURE the clip using the photo-jpeg 100% codec the image is BRIGHTER!

Ideally, I’d like to be able to do these conversions in cleaner or quicktime, but it looks like I’m going to have to do all of them from within Final Cut. What’s up with this disparity? Doesn’t final cut use quicktime to convert its movies? Why would they produce different results?

I’m on a G5 with blackmagic SD extreme card Final Cut Pro 5. Latest blackmagic drivers. Latest FCP updates.

Thanks,
Sam

[Kristian Lam]

[sammyg] “… convert to photo-jpeg 100% using quicktime, the image is darker
… convert to photo-jpeg 100% using cleaner, the image is darker
… convert to motion jpeg a or b 100% using quicktime, the image is daker
… convert to photo-jpeg 100% using final cut pro (quicktime conversion, not off a sequence just a straight clip conversion), the image is PERFECT! SAME LUMA!

This is Quicktime at work and we cannot do anything about it. Fortunately, Final Cut Pro handles it correctly and I would recommend using Final Cut Pro when exporting.

… if I CAPTURE the clip using the photo-jpeg 100% codec the image is BRIGHTER!”

Thanks for this one. I think it’s something we’ll need to investigate.

regards

Kristian Lam
Blackmagic Design