View Full Version : Grabbing still frames


Kristian Indrehus
December 31st, 2005, 09:40 AM
Just got my XL-H1 and playing with it I discovered how easy it is to grab frames from tape. Pressing the photo button while tape is running pauses the tape while the frame is grabbed. When released tape continues and I can grab new stills. Since I donīt have a HD screen yet I thought Iīd have a look at the still quality looking at my Benq 1280x1024 LCD. Beeing used to SD grabs i think the results looks really great. Makes me wanne buy a bigger memory card.
Can I use any SD card?

Hereīs a frame grab of my sisters cat. Camera was handheld recording HD 25F to tape in ordinary light.
http://img403.imageshack.us/my.php?image=img01340rr.jpg

pk

Robert Niemann
December 31st, 2005, 09:47 AM
Puh, for a frame grab from a moving picture this is outstanding sharp, is it not?

Tony Davies-Patrick
December 31st, 2005, 09:57 AM
The 'still' capture has a lot of colour fringing etc, (which is normal for video when compared to the much higher quality obtained from 35mm SLR images) - but Robert is right in that it is quite a good 'grab' image from moving tape.

Pete Bauer
December 31st, 2005, 11:21 AM
Per,

That looks fabulous! Also remember that you can record still images to an SD card while shooting, simultaneously and without interruption of video recording. Of course, as you've done, you can also capture a still image from a tape that has already been recorded to the SD card, so you can go back later and decide exactly what still frames you'd like to extract without even worrying about the still shots while recording video.

I may be remembering wrong, but I believe I remember seeing something in Canon literature that the still images may be processed by the DIGIC chip in a separate way from the video so that each is optimized for its purpose, either motion picture or still frame. In any case, these new cameras are amazing!

Kristian Indrehus
December 31st, 2005, 11:57 AM
The 'still' capture has a lot of colour fringing etc, (which is normal for video when compared to the much higher quality obtained from 35mm SLR images) - but Robert is right in that it is quite a good 'grab' image from moving tape.

How do I see the color fringing? There is some blue spill light from a window to the right of the cat, but apart from that I'm not sure what to look for.

I used autofocus by the way. Cinegamma2 and I tweaked the color matrix some to get rid of the magenta tint many are complaining about. Otherwise I was just pointing the camera in the cats direction and pressed record.
I look forward to see the actual footage on a HD plasma.

pk

Kristian Indrehus
December 31st, 2005, 12:10 PM
Wait a minute. I see it now. The white hairs has blue and red lines.
Well, as you said. It's to be expected. Still quite sharp for a moving picture and 25 shutter.

Happy New Year!

Shannon Rawls
December 31st, 2005, 12:30 PM
WOW. You grabbed that single frame from the tape being played back @ 25p HDV? And simply posted it to the internet from the SD card?
Gee Wiz that pretty.


Makes me wanne buy a bigger memory card.
Can I use any SD card?

Per,

http://www.dvinfo.net/conf/showpost.php?p=398776&postcount=4

- ShannonRawls.com

Kristian Indrehus
December 31st, 2005, 03:31 PM
Thanks for the link Shannon. And yes, that´s exactly what I did. I just pressed the photo button on top of the handle watching the lcd/WF as the tape was playing. And then downloaded to the net directly from the card. I made four or five grabs and they all look equally sharp.

pk

Johan Forssblad
January 1st, 2006, 06:29 AM
Just got my XL-H1 and playing with it I discovered how easy it is to grab frames from tape.

Gott nyttt år, Per and everybody else. Nice photo of the cat.

I wonder if anybody out here has compared the results by taking an SD card photo directly with capturing it from a taped video sequence? Will they look about the same or do they differ in quality so it is worth taking them as still photos first? If not much difference the ability to select a photo out of this 25 fps stream is exceptional. Just think how you could get a nice shot from a person talking.

BTW Per Kristian, var befinner du dig i Norge?

Kevin Wild
January 1st, 2006, 09:47 AM
First off, the picture would be about 1/3rd the size. There would definitely be a huge difference in rez, too.

KW

Kristian Indrehus
January 1st, 2006, 03:48 PM
For those interested, here is a grab from my DV timeline. Iīm not sure itīs exactly the same frame as the first one, but close enough. Today I captured XL footage for the very first time. Since I donīt have an HD display yet, I simply captured DV through firewire from the XL. The frame grab now is from a DV compressed 720*576(PAL) FCP timeline. I exported using quicktime conversion, then re-stretched the frame out to 16/9 in photoshop and saved to JPG. No other corrections.

I must say that Iīm very pleased with what this camera outputs even when downcoverting. Itīs very sharp even in SD. Iīm going to make better SD video now then ever before.

http://img326.imageshack.us/img326/5883/catfromdvtimeline3mw.jpg

Johan, jag bor i Larvik. 13mil søder for Oslo :)

A. J. deLange
January 2nd, 2006, 09:58 AM
There shouldn't be much difference. The camera has 1440 x 1080 pixels. If you take a still directly to the card the camera does the interpolation up to 1920 x 1080, converts that to JPEG and writes it to the card. If you take HDV and capture it to your computer you are capturing a stream of 1440 x 1080 pixel images which are essentially coded as JPEG. If you take a frame from this stream into PS or a similar program and interpolate up to 1920 x 1080 and save that as JPEG the result will be very similar to what you would read from the card if you had taken a still with the camera. There is one difference, however. I am sure that if you take an image in card mode it is direct CCD data that is processed IOW an I frame. If you take a frame from a sequence you have captured from tape you could be getting a P frame or B frame which, presumably, will be of lesser quality than an I frame. But one of the things I find remarkable about this camera is that I can't tell which frames are the I frames in stepping through a captured tape sequence.

Michael Pappas
January 2nd, 2006, 04:44 PM
Thanks! Can you get more shots like this posted up?



Just got my XL-H1 and playing with it I discovered how easy it is to grab frames from tape. Pressing the photo button while tape is running pauses the tape while the frame is grabbed. When released tape continues and I can grab new stills. Since I donīt have a HD screen yet I thought Iīd have a look at the still quality looking at my Benq 1280x1024 LCD. Beeing used to SD grabs i think the results looks really great. Makes me wanne buy a bigger memory card.
Can I use any SD card?

Hereīs a frame grab of my sisters cat. Camera was handheld recording HD 25F to tape in ordinary light.
http://img403.imageshack.us/my.php?image=img01340rr.jpg

pk

Kristian Indrehus
January 3rd, 2006, 06:40 PM
Thanks! Can you get more shots like this posted up? Hereīs a few more. Remember they are all random grabs. Not hand picked from a timeline. Theese went through photoshop auto levels to kill a nasty green tint. I overcompensated for the magenta tint in camera prior to shooting. Itīs hard to see what youīre actually doing watching the color WF. Anyway, here are the links:

http://img249.imageshack.us/img249/2484/cat22nj.jpg
http://img431.imageshack.us/img431/3372/cat38kj.jpg
http://img254.imageshack.us/img254/3200/cat40fr.jpg

If someone can tell me how to get HDV into FCP I will post the orginal video.
In the meantime Iīve uploaded a dv downrez clip on my site. I forgot the .mov ext. so remember to add it to the file name.

http://indrehus.net/produkter/studio/hd/hd.html

pk

Josh Dahlberg
January 3rd, 2006, 10:46 PM
Thanks for the frames - good work - some more would be nice, any chance of a human portrait? Maybe some street shots if you have time...

So, how are you finding the camera so far? Does it meet your expectations? Any bugs you've come across?

:-)

Kristian Indrehus
January 6th, 2006, 03:26 PM
Sorry it took so long, Iīm in the middle of a production editing all day long.
I did a quick try on a portrait today. Itīs definitely not pro lit, but anyway.
0 gain, 25 shutter, open iris. Camera default colors. Shot in photo-mode, uploaded straight from the card.

I also pointed the camera at my aquarium. Aquarium picīs are random grabs from tape and have been tweaked a little in photoshop and uploaded at 50%.

http://indrehus.net/produkter/studio/hd/page20/page20.html

So far I have found no bugs with this camera. It feels solid and the lens is beautiful. The weak link is the VF as I see it. The colors are wrong and itīs hard to focus. That said, itīs so bright you can use it as LDC display in broad daylight :) And there is a BW pro VF for those with the doll. I think this camera is great for itīs intended use, and itīs perfect for carrying around. The SDI out gives the camera an edge against the competition, and weīll probably see some clever ways of putting it to use in the future.

Tony Davies-Patrick
January 6th, 2006, 04:33 PM
Nice frame grabs. The close-up of the girl's eyes shows good image detail - the sort of image detail I've been looking for in a single video frame.

Thanks for showing them, Per.

Antoine Fabi
January 6th, 2006, 04:39 PM
amazing !
beautifull images.

Josh Dahlberg
January 6th, 2006, 06:41 PM
Thanks Kristian, looks like a very promising camera, nice work!

Michael Pappas
January 6th, 2006, 07:00 PM
You didn't shoot to HDV first, then copy to SD card.

If you shot straight from ccd to SD card avoiding the HDV codec engine than this test in absolute invalid for filmmakers.

That would be a test for digital still photography. My GL2 pics on DVinfo, shot direct to memory card look very good, but that is not how the GL2 video looked. Same thing applies here.

Can you confirm please; since this could mislead people to the quality of the H1. Not that I have an issue with the H1, but it's imperative to keep facts and tests as pure as possible.

My shots came from the HDV material then to SD card. This gives you an idea of the recorded image to HDV tape.

XLH1 and HVX200 frame grabs and news here:
http://www.pbase.com/Arrfilms



Michael Pappas
Arrfilms@hotmail.com
PappasArts & Arrfilms Main site

XLH1 and HVX200 frame grabs and news here:
http://www.pbase.com/Arrfilms

http://www.PappasArts.com
http://www.Myspace.com/




Sorry it took so long, I´m in the middle of a production editing all day long.
I did a quick try on a portrait today. It´s definitely not pro lit, but anyway.
0 gain, 25 shutter, open iris. Camera default colors. Shot in photo-mode, uploaded straight from the card.

I also pointed the camera at my aquarium. Aquarium pic´s are random grabs from tape and have been tweaked a little in photoshop and uploaded at 50%.

http://indrehus.net/produkter/studio/hd/page20/page20.html

So far I have found no bugs with this camera. It feels solid and the lens is beautiful. The weak link is the VF as I see it. The colors are wrong and it´s hard to focus. That said, it´s so bright you can use it as LDC display in broad daylight :) And there is a BW pro VF for those with the doll. I think this camera is great for it´s intended use, and it´s perfect for carrying around. The SDI out gives the camera an edge against the competition, and we´ll probably see some clever ways of putting it to use in the future.

Kristian Indrehus
January 6th, 2006, 07:31 PM
You didn't shoot to HDV first, then copy to SD card.
Can you confirm please; since this could mislead people to the quality of the H1. Not that I have an issue with the H1, but it's imperative to keep facts and tests as pure as possible.


I agree, it could be misleading. The portraits - as stated - are shot in PHOTO-MOOD. They are NOT frame grabs. They have never gone through the HDV kodec.

This initially posted one however, is definitely a random grab from HDV tape.
Captured to memory card while the camera was playing. It shows some detail too. http://img403.imageshack.us/my.php?image=img01340rr.jpg

Next time I will do a comparison. Or how about some moving ones.
Isnīt that what weīre doing?

Michael Pappas
January 6th, 2006, 07:43 PM
Oh yes your the one that filmed the cat. I didn't make the connection.

Kristian, could you film the young lady just as you did for the still; but this time in HDV?

Those shot's would be valuable to analyze if you could in HDV mode then make SD pics from tape. The fish tank to if you have the chance.


Thanks!

Kristian Indrehus
January 6th, 2006, 08:33 PM
Kristian, could you film the young lady just as you did for the still; but this time in HDV?

Those shot's would be valuable to analyze if you could in HDV mode then make SD pics from tape. The fish tank to if you have the chance.
Thanks!

I will, and the fish tank picīs is random grabs 25f from HDV tape by the way.

I didnīt upload them in full size simply because itīs so darn hard to grab some sharp ones pressing the photo button on the camera watching the tape play in the VF.

They serve the purpose as some eye-candy with nice colors, and I donīt think itīs fair to use them as resolution test picīs. First theyīre distorted by going through the glass of the tank.(rounded glass) In the tank everything is moving constantly including the water. The DOF feels like 10-mm, and of course the fishes themselves wonīt keep still a single second. I tried to teach them, but they wouldnīt listen :(

At 25f there obviously isnīt much room for movment unless you want to study the nice motion blur the H1 does. What seems dead sharp playing the tape at this shutter speed, can look pretty blurred watching a still.

Now, if I could only find a way of getting the footage into FCP iīd be delighted to pick some nice frames from the timeline. Seems like I will have to get the HD-deck-link right away. Yeah, I think I will. :)

Kristian Indrehus
January 7th, 2006, 06:42 PM
Looks like I didn´t need the HD deck-link after all. Not for now anyway.
HDV capturing through firewire is no big deal at all. ( Thanks to Jonas at this thread http://www.dvinfo.net/conf/showthread.php?t=57644 )

Instead of up-loading more grabs, here´s the original clip of the cat.
It´s a quick-time mov. export from the timeline. 30-sec, 300MB
I´ve also uploaded a smaller H.264 compressed 1280x720 42 MB. version.

Here´s the link: http://indrehus.net/produkter/studio/hd/footage/footage.html

Johan Forssblad
January 24th, 2006, 05:27 AM
Hello folks,
Can we get the still photo on the SD card in the XL H1 out on its Firewire to a computer or is it mandatory to carry a separate card reader?
I tried to connect the H1 to my Apple but it was not able to recognize it in any tried program.
Is there any special setting for this or do we have to remove the card from the camera in order to get the pictures out? Maybe I am missing a menu setting I havn't found yet. (The still photos are visible in the camera viewfinder.)
I don't find any advice in the manual.
Thankful if you know how to do.

Shannon Rawls
January 24th, 2006, 09:07 AM
John, you will need a reader. The camera does not show up as a hard drive on any computer.

- ShannonRawls.com