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#16
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screenshot resolution
On Fri, 1 Mar 2019 13:49:54 +0000, "J. P. Gilliver (John)"
wrote: In message , Shadow writes: On Tue, 26 Feb 2019 13:31:10 -0500, BillAhearn wrote: If I press print screen when a video is playing at any given resolution, do I gain resolution by going full screen and then pressing print screen? Use VLC and take snapshots with the hotkey. []'s [] WHY do people not READ what someone says? He has clearly said, several times, that he's talking about using the video player functionality of various websites, such as YouTube, and is _not_ interested in downloading the videos. I was scrolling down, and noticed the question. He didn't state that. Call me lazy, or something for not reading all the follow-ups. Or maybe he should have made a more concise question. I ALWAYS download videos at 480p before watching them. Then delete, if it's trash, or re-download at a higher resolution if it's a keeper. []'s -- Don't be evil - Google 2004 We have a new policy - Google 2012 Nineteen Eighty-Four was a work of FICTION !!!! - Orwell |
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#17
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screenshot resolution
J. P. Gilliver (John) wrote:
In message , Shadow writes: On Tue, 26 Feb 2019 13:31:10 -0500, BillAhearn wrote: If I press print screen when a video is playing at any given resolution, do I gain resolution by going full screen and then pressing print screen? Use VLC and take snapshots with the hotkey. []'s [] WHY do people not READ what someone says? He has clearly said, several times, that he's talking about using the video player functionality of various websites, such as YouTube, and is _not_ interested in downloading the videos. Downloading videos is for *research purposes*. Using carefully controlled conditions on your own desktop, you can observe what things do and do not give extra resolution. Once you *understand* what is happening, you can use any method you want. You cannot take screenshots of Flash videos where the Flash plugin is using "Hardware Acceleration". The same can happen in VLC (if it uses hardware acceleration, the movie frames are in the wrong plane). If the browser has native video support (like Ogg/Theora perhaps), again, there can be various attempts at acceleration which defeat PrtScn. So PrtScn is not a panacea. FRAPS can "record anything", but, it costs money. Various other tools may record from one of three planes, but FRAPS is the only one that offers all three planes of coverage when recording. You can also record your screen with a hardware capture card, which takes some of the protections out of the picture. If the software makes a concerted effort to use HDCP, then you could be denied capture with a capture card. ******* This is why *downloading* the movie, helps... No matter what the OP posts, we can *still* offer hard-earned advice! Paul |
#18
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In message , Paul
writes: J. P. Gilliver (John) wrote: In message , Shadow writes: On Tue, 26 Feb 2019 13:31:10 -0500, BillAhearn wrote: If I press print screen when a video is playing at any given resolution, do I gain resolution by going full screen and then pressing print screen? Use VLC and take snapshots with the hotkey. []'s [] WHY do people not READ what someone says? He has clearly said, several times, that he's talking about using the video player functionality of various websites, such as YouTube, and is _not_ interested in downloading the videos. Downloading videos is for *research purposes*. Yes, but I think you're researching things the OP isn't interested in! [] You cannot take screenshots of Flash videos where the Flash plugin is using "Hardware Acceleration". The same can happen in VLC (if it uses hardware acceleration, the movie frames are in the wrong plane). If the browser has native video support (like Ogg/Theora perhaps), again, there can be various attempts at acceleration which defeat PrtScn. Yes, there are lots of reasons why PrtScn won't work. But, for the OP, it _is_ working, so I doubt he's that interested in the cases where it won't! [] You can also record your screen with a hardware capture card, which takes some of the protections out of the picture. If the software makes a concerted effort to use HDCP, then you could be denied capture with a capture card. Again, far more complexity than the OP - as I read it - is interested in doing. ******* This is why *downloading* the movie, helps... No matter what the OP posts, we can *still* offer hard-earned advice! Yes, but we can also get carried away, into answering in far more depth than the OP has any intention of going. Sure, sometimes doing so can extend what he that shall be nameless used to call "tribal knowledge", but equally it can drive people away. Paul John -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf .... of the two little boxes in the corner of your room, the one without the pictures is the one that opens the mind. - Stuart Maconie in Radio Times, 2008/10/11-17 |
#19
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screenshot resolution
In message , BillAhearn
writes: On Thu, 28 Feb 2019 08:22:09 +0000, wrote: In message , BillAhearn writes: [] It is correct I am only viewing the web videos in a browser using whatever viewer the web browser uses at whatever resolution the video is which is usually pretty bad. [] I take about two snapshots per video using the print screen button (alt print screen worked too) where there there are hundreds of these videos [] and I don't want to spend the time to download every video since I don't need the video once I take the snapshot. [] Then I crop the snapshot with any editor where the crop is an odd shape for each snapshot and then I add backgrounds and filters and effects using photoshop or fotosketcher. The crop is never a simple shape like an on axis ellipse or rectangle which is why I need the whole image first before I crop it, where I sometimes use the magic wand to begin the cropping of areas. Well, it probably _is_ worth your while just doing a test capture/crop or two where you _do_ just crop to the rectangle the video occupies in the browser when you're not viewing full screen, just so you can _compare_ the resultant image with the same one viewed full screen. [] Since the original snapshot is so bad in resolution it's hard to tell if the full screen is any different than the normal sized video in the browser in resolution. [] I loved that video which is designed for test screenshots! https://www.youtube.com/watch?v=KSFgolB7HHE Well, it isn't _designed_ for that purpose! It's just a collection of TV test cards. I had to turn off the sound though which you'll know why! My monitor is 1680x1050 and an normal final result is 845x904. You mean, after you've done a PrtScn from normal browser and cropped to the size of the rectangle the video part occupies, it comes out at 845×904? That's more than most of the videos I _suspect_ you'll be copying from (though wouldn't for the test card one as that's 1280×720). How can I upload the test screenshots to you? Put them on any picture-sharing site, or your own website, and post the relevant URL. But really, I wanted _you_ to check: capture (from the same test card, obviously) in both full-screen and not, and look at the various gratings in the images; note which gratings you can see the individual black and white lines, and which just look like a grey block. Look at your full-screen and not-full-screen captured images at the same size (such as full screen): do you get more gratings and fewer grey blocks in the full-screen capture? If so, it's worth doing (for that video anyway); if not, it isn't. Tell us what you decide. -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf I long for the commercialised Christmas of the 1970s. It's got so religious now, it's lost its true meaning. - Mike [{at}ostic.demon.co.uk], 2003-12-24 |
#20
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screenshot resolution
J. P. Gilliver (John) wrote:
In message , BillAhearn I loved that video which is designed for test screenshots! https://www.youtube.com/watch?v=KSFgolB7HHE Well, it isn't _designed_ for that purpose! It's just a collection of TV test cards. I had to turn off the sound though which you'll know why! My monitor is 1680x1050 and an normal final result is 845x904. You mean, after you've done a PrtScn from normal browser and cropped to the size of the rectangle the video part occupies, it comes out at 845×904? That's more than most of the videos I _suspect_ you'll be copying from (though wouldn't for the test card one as that's 1280×720). How can I upload the test screenshots to you? Put them on any picture-sharing site, or your own website, and post the relevant URL. But really, I wanted _you_ to check: capture (from the same test card, obviously) in both full-screen and not, and look at the various gratings in the images; note which gratings you can see the individual black and white lines, and which just look like a grey block. Look at your full-screen and not-full-screen captured images at the same size (such as full screen): do you get more gratings and fewer grey blocks in the full-screen capture? If so, it's worth doing (for that video anyway); if not, it isn't. Tell us what you decide. A video presented like this, has low resolution to begin with. Resizing to 1680x1050 doesn't give any extra information to work with. The video is smaller than the screen, and full screen won't help the actual results. 160 mp4 256x144 DASH video 108k , avc1.4d400b, 25fps, video only Whereas this one, being "larger" than the OPs screen, can profitably be resized to full screen before PRTSCN. There is "resolution to be harvested", so making the video display full screen at 1680x1050 is helping. 137 mp4 1920x1080 DASH video 5093k , avc1.640028, 25fps, video only Youtube would normally present in some "best" format, which isn't actually maximum resolution, but includes both video and sound. 22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best) If that one was shown at 1280x720, you're getting all the pixels, and making it larger than that (1680x1050) isn't really helping all that much. If right-clicking on an Adobe Flash video, the "Stats for Nerds" option may show the native resolution of the video. I don't know if HTML5 based videos have "Stats for Nerds" as an available feature or not. Youtube prefers HTML5 today, and it may be harder to convince them to use FLV (flash) instead. Paul |
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