screenshot resolution

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?

In article , 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?

you'll gain more pixels by going full screen but the quality depends on
the resolution of the original video and any scaling to get it to full
screen.

and it's much easier to simply extract the desired frames than trying
to print screen.

On Tue, 26 Feb 2019 13:37:24 -0500, nospam
wrote:

In article , 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?

you'll gain more pixels by going full screen but the quality depends on
the resolution of the original video and any scaling to get it to full
screen.

and it's much easier to simply extract the desired frames than trying
to print screen.

That is true but you usually find that the frames in video are fairly
low resolution anyway.
If you are doing a print screen use the highest resolution your
monitor supports and still gives a real "full screen".

In message ,
writes:
On Tue, 26 Feb 2019 13:37:24 -0500, nospam
wrote:

In article , 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?

My first instinct is to say no, at least if you mean _useful_
resolution.

you'll gain more pixels by going full screen but the quality depends on
the resolution of the original video and any scaling to get it to full
screen.

Yes, you'll get more _pixels_. If the isn't an integer multiple, you'll
_lose_ data.

and it's much easier to simply extract the desired frames than trying
to print screen.

Yes - what are you using to view the video? Most standalone players have
a "snapshot" function (often, as in VLC, with a camera icon on it). If
you're viewing as part of a web page of some sort, you're at the mercy
of the page designer.

That is true but you usually find that the frames in video are fairly
low resolution anyway.

If playing in VLC, you can find out the resolution of the original file
(it's under "CoDec"). I think most other standalone players have a
similar function.

If you are doing a print screen use the highest resolution your
monitor supports and still gives a real "full screen".

Unless the original material has higher resolution than your monitor, I
_wouldn't_ do that.

If you're doing PrintScreen, experiment with Alt-PrintScreen too,
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

I hate people who quote Shakespeare at you but are proud that they can't add
up. Stupid People. - Carol Vorderman (Radio Times, 1-7 March 2003)

On Wed, 27 Feb 2019 01:10:57 +0000, wrote:

In message ,
writes:
On Tue, 26 Feb 2019 13:37:24 -0500, nospam
wrote:

In article , 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?

My first instinct is to say no, at least if you mean _useful_
resolution.

you'll gain more pixels by going full screen but the quality depends on
the resolution of the original video and any scaling to get it to full
screen.

Yes, you'll get more _pixels_. If the isn't an integer multiple, you'll
_lose_ data.

and it's much easier to simply extract the desired frames than trying
to print screen.

Yes - what are you using to view the video? Most standalone players have
a "snapshot" function (often, as in VLC, with a camera icon on it). If
you're viewing as part of a web page of some sort, you're at the mercy
of the page designer.

That is true but you usually find that the frames in video are fairly
low resolution anyway.

If playing in VLC, you can find out the resolution of the original file
(it's under "CoDec"). I think most other standalone players have a
similar function.

If you are doing a print screen use the highest resolution your
monitor supports and still gives a real "full screen".

Unless the original material has higher resolution than your monitor, I
_wouldn't_ do that.

If you're doing PrintScreen, experiment with Alt-PrintScreen too,
--

The quality isn't good where I just don't want to make it worse than it is.

I'm simply streaming movies off youtube or web sites at low resolution like
240p.h264.mp4 or 480p.h264.mp4 or 720p.h264.mp4 and then finding a frame I
like and hitting print screen and then I edit the PNG file in photoshop and
fotosketcher in artistic ways.

It's not a high precision task where I'm just asking about the difference
in resolution between the original small view inside a web page and the
full screen view inside that web page at full screen.

Going full screen takes a while for the "Press escape to exit full screen"
to go away, and then I lose the moment and have to keep scrolling back and
forth constantly to get it back.

If I don't gain resolution by going full screen then I'd rather not wait
for that "Press escape to exit full screen" to constantly come up hundreds
of times as I capture the screen.

If hitting full screen gains resolution then the wait hassle might be worth it.
If hitting full screen doesn't gain resolution then the hassle isn't worth it.

BillAhearn wrote:


The quality isn't good where I just don't want to make it worse than it is.

I'm simply streaming movies off youtube or web sites at low resolution like
240p.h264.mp4 or 480p.h264.mp4 or 720p.h264.mp4 and then finding a frame I
like and hitting print screen and then I edit the PNG file in photoshop and
fotosketcher in artistic ways.

It's not a high precision task where I'm just asking about the difference
in resolution between the original small view inside a web page and the
full screen view inside that web page at full screen.

Going full screen takes a while for the "Press escape to exit full screen"
to go away, and then I lose the moment and have to keep scrolling back and
forth constantly to get it back.

If I don't gain resolution by going full screen then I'd rather not wait
for that "Press escape to exit full screen" to constantly come up hundreds
of times as I capture the screen.

If hitting full screen gains resolution then the wait hassle might be worth it.
If hitting full screen doesn't gain resolution then the hassle isn't worth it.

One word: Youtube-dl

https://github.com/rg3/youtube-dl

https://rg3.github.io/youtube-dl/download.html

https://yt-dl.org/downloads/2019.02.18/youtube-dl.exe

8,017,264 bytes

SHA256 87c073632798ea5b8d515814c87dbd49f1e13b07ec285d2bfd 6757b8506d19c9

*******

I run mine in a Linux Mint VM.

paul@HOME ~ $ youtube-dl --list-formats https://www.youtube.com/watch?v=83K8wV7Z0gE
[youtube] 83K8wV7Z0gE: Downloading webpage
[youtube] 83K8wV7Z0gE: Downloading video info webpage
[youtube] 83K8wV7Z0gE: Extracting video information
[youtube] 83K8wV7Z0gE: Downloading MPD manifest
[youtube] 83K8wV7Z0gE: Downloading MPD manifest
[info] Available formats for 83K8wV7Z0gE:
format code extension resolution note
139 m4a audio only DASH audio 49k , m4a_dash container, mp4a.40.5@ 48k (22050Hz)
140 m4a audio only DASH audio 128k , m4a_dash container, mp4a.40.2@128k (44100Hz)
160 mp4 256x144 DASH video 108k , avc1.4d400b, 25fps, video only
133 mp4 426x240 DASH video 242k , avc1.4d400c, 25fps, video only
134 mp4 640x360 DASH video 575k , avc1.4d401e, 25fps, video only
135 mp4 854x480 DASH video 1155k , avc1.4d4014, 25fps, video only
136 mp4 1280x720 DASH video 2310k , avc1.4d4016, 25fps, video only
137 mp4 1920x1080 DASH video 5093k , avc1.640028, 25fps, video only
17 3gp 176x144 small , mp4v.20.3, mp4a.40.2@ 24k
36 3gp 320x180 small , mp4v.20.3, mp4a.40.2
43 webm 640x360 medium , vp8.0, vorbis@128k ===
18 mp4 640x360 medium , avc1.42001E, mp4a.40.2@ 96k
22 mp4 1280x720 hd720 , avc1.64001F, mp4a.40.2@192k (best)

To download in a specific format:

cd /d C:\some\place\unique\I\will\be\able\to\find

youtube-dl --format 137 https://www.youtube.com/watch?v=83K8wV7Z0gE

*******

L: is my RAMDisk, which makes less noise when doing something
like this. Select the output folder first, then put a series
of BMP files with names like a000000.bmp a000001.bmp and so on.
This converts an entire movie into BMP files. JPG is also
an option. I think the -q:v 1 option is an attempt to select
"highest quality", which might be more important for the JPG
choice. The BMP by comparison, does not compress, and is a
pig on storage.

cd /d L:\movieout

C:\FFMPEG\bin\ffmpeg -i L:\bears.mp4 -f image2 -q:v 1 -c:v bmp a%06d.bmp

(Take the latest "static" build from the release versions
at the bottom here. Some of the nightly builds in the past
were "missing a DLL", and are a more risky download. For
example, the 4.1.1 might work. In some cases, WinXP might
require a previous version, like maybe 3.4.2. Don't throw away
a version which doesn't work in WinXP, as you might have some
other OS it works in.

https://ffmpeg.zeranoe.com/builds/win32/static/

The main selector is a bit ugly, depending on your browser.

https://ffmpeg.zeranoe.com/builds/

And don't do that on a Hollywood movie, as a two hour movie
takes 200-400GB or more of space for the BMP files. Even for
JPGs it's going to be big. However, for a 10 minute
video on Youtube, you can probably manage it.

You can still store such things on a hard drive. Just
don't expect File Explorer to behave nicely :-)

I can "review" a folder of JPEG files with Avidemux 2.5. It
has the ability to "play" a folder containing thousands of
carefully numbered files such as a000000.jpg. The frame
number is in the player controls at the bottom of the screen,
and will enable you to guesstimate which JPGs you want for
your artwork.

So there's really no reason to involve screenshots at all.
The BMP being collected here, gets "all the bits" that
were encoded into the representation. If the movie is
encoded at 1920x1080, that's how big each JPG would be.
Blowing it up via "Interpolation" does not add any
resolution. The only additional source of information
is temporal, in that the frames before or after
a selected frame, could in theory be processed to
produce a better still image. I don't know what
tool, or how to do that...

Paul

In message , BillAhearn
writes:
[]
The quality isn't good where I just don't want to make it worse than it is.

I'm simply streaming movies off youtube or web sites at low resolution like
240p.h264.mp4 or 480p.h264.mp4 or 720p.h264.mp4 and then finding a frame I
like and hitting print screen and then I edit the PNG file in photoshop and
fotosketcher in artistic ways.

So you're not viewing a file in something like VLC, and I sense that you
don't want the bother of downloading or using any other software.

If you _know_ the videos are 240, 480,or 720, then going full-screen
will not give you the resolution your display has - it can't give you
more information than there is in the original video, only more pixels.
When you do your screen capture with PrtScn (or Alt-Prt-Scn), I presume
the first thing you do is crop the resulting image to just the video
window from the webpage. When you do that, what size - in pixels - is
the resulting cropped image? I suspect it's _already_ more than 240 at
least.

It's not a high precision task where I'm just asking about the difference
in resolution between the original small view inside a web page and the
full screen view inside that web page at full screen.

Going full screen takes a while for the "Press escape to exit full screen"
to go away, and then I lose the moment and have to keep scrolling back and
forth constantly to get it back.

If I don't gain resolution by going full screen then I'd rather not wait
for that "Press escape to exit full screen" to constantly come up hundreds
of times as I capture the screen.

If hitting full screen gains resolution then the wait hassle might be worth it.
If hitting full screen doesn't gain resolution then the hassle isn't worth it.

It depends on (a) what resolution the original video is (b) whether
going full screen does anything other than just drawing bigger.

If the original video is low resolution, then you're not going to get
more whatever you do!

If the original video is high or higher resolution, then its between the
coding of the web page, your browser, and possibly the hardware in your
system as to whether going full screen gives you any benefit.

It'd be fairly simple to find out: find a video with fine detail, and
compare captures taken by your two methods (unless the fine detail is in
that part of the screen, no need to wait for the "press Esc" to
disappear for the purpose of this test). It _may_ vary between websites
though.

A suitable? video to try on would be
https://www.youtube.com/watch?v=KSFgolB7HHE - lots of different test
cards (the first one is on for a minute; others - details below in the
YouTube page). (Click SHOW MORE.)
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

did you hear about the guy who was frozen to absolute zero? He was 0K ...
- Jason in alt.windows7.general (and three other 'groups), 2018-5-1

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?

A print screen takes a screenshot of the current screen at the current
screen resolution. The process doesn't involve changing the screen
resolution.

Going full screen depends on the application which modifies the screen
resolution. It may use the native screen resolution which is supported by
the monitor (i.e. the monitor's maximum screen resolution); or keep using
the current screen resolution; or in case of Intel display adapter: use
display driver's highest screen resolution (above monitor's maximum screen
resolution) where actual screen resolution used would be the monitor's
native resolution, and the GPU does the image scaling.

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

//To take snapshots in VLC:

Make sure that the video for which you want to take the snapshot
is playing.
When you reach the part of the video which you want to save as a
picture, pause it if you want.
Press the shortcut for taking snapshot. ...
In Windows: SHIFT + S.
In Linux: CTRL + ALT + S.
In Mac OS X: Command + ALT + S.//
--
Don't be evil - Google 2004
We have a new policy - Google 2012
Nineteen Eighty-Four was a work of FICTION !!!! - Orwell

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.
--
J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf

It is complete loose-stool-water, it is arse-gravy of the worst kind
- Stephen Fry on "The Da Vinci Code"

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

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

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