From: "Steve Oakley" Received: from mout.perfora.net ([74.208.4.196] verified) by media-motion.tv (CommuniGate Pro SMTP 6.1.0) with ESMTPS id 6350442 for AE-List@media-motion.tv; Sat, 04 Nov 2017 19:50:11 +0100 Received: from [10.1.1.106] ([71.87.57.30]) by mrelay.perfora.net (mreueus003 [74.208.5.2]) with ESMTPSA (Nemesis) id 0M4pkR-1dD2xJ0yzd-00yzQK for ; Sat, 04 Nov 2017 19:53:04 +0100 Content-Type: multipart/alternative; boundary="Apple-Mail=_C71A3E4D-DE6F-4FBA-B3DF-15DBF150B408" Mime-Version: 1.0 (Mac OS X Mail 11.2 \(3445.5.11\)) Subject: Re: [AE] Resolution Mystery Date: Sat, 4 Nov 2017 13:53:02 -0500 References: To: After Effects Mail List In-Reply-To: Message-Id: <19BFE2A7-EC84-415F-B40C-F93BD4A0878C@practicalillusions.com> X-Mailer: Apple Mail (2.3445.5.11) X-Provags-ID: V03:K0:CODOax/azYfyV1qCvGudEdeYtb2j2D25rG2Qh3y0BaUI/0KBtYR 3JavGNnk+Xd9nidteCB9f4Tzdjb6ioPsbw8R97OIv5nFdzSI1ptepHfKzeu9mIgpghT38xB jUhlcVDwLi6HVKMdQ3gg+fNz3MeCbShaisgDoqt3tDnT3VhTVIx51tHMdyT32jtiyOeo3+O PiT4yEUFdI11oeu21UyZw== X-UI-Out-Filterresults: notjunk:1;V01:K0:1Qq4JP2A4zo=:bgqOASwdYl66xBIEr4mp0k 1U6/PULyRhmmRXeDqtD81x5rj6qYvim8AkQwxJAmc6Uom/w9zKfrU1nh3TLJF/Ko/EAIfiEvk cS2kTE/74In8BGfNVc7waORYRBAQos2vHJMC8CjEzFmaI09wNdOtpX+R8TDMv9NIHjf2MVqmy V5/rzKuNVZq4j8ASr5JAM5WZzzL+2QLLV+rvemeOKMeo16WiDMD2e8USfL81CubKvV/Gj4Djd E8jgTB0Pk7aYZOrlcPxakXxAyO7DLDQKW/XxxOoZMTsTzzheqJ2J8E9XOrCs4raCO7QYSw6rx F6ffZgLE6yZv2x3edA/sdaEUQQuxJml4SBxrzlvNVycGQDDPBNfqGrmhbgmJdnVSXLXTwvpUt edI99+Nn6xMEc6v30UrW8couo9AX/LHE4b3sKmhH06eXcZYsH9tBxKhdD3oVoDm1Dz3XWSxN2 C3gE5pwFgGjxSSaIKqDV+Rrf/EwHW1w2NrDyYxd3728KOBPt/yWVf2hCrUVglb11xDC2+Xxqr HZk0B+O1la39yRhHXE7a0Di2Y+ZW6c1XJvMxsGD8lE83VaTH3ViVHCsCo7gXLKWZmzZlzC9Eq MHGqPLMVboA9BfBsn51/GfylyHZNjnx35PGstmvPBTEbIv0IH4n8wSGvPaxCspn93kUOoSnJr B6ldrgFXfZh6WDjc1vebAJDVXqgIAeFlMKHYpTyCdIuLMtSwnlw7Nn40xL4ZplgIp8IgLaioD 6Q3wqjqpQwBqx45UHkdm9WBqA6rqvUNSeuyAfXkQz5DRjJ+FdWjuVfsjnL0= --Apple-Mail=_C71A3E4D-DE6F-4FBA-B3DF-15DBF150B408 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 an inch is an inch. doesn=E2=80=99t matter where you measure it, its = always the same. a better way of expressing DPI / PPI : its a scaling factor saying how = many pixels per measure unit to use. its not a measure of resolution, = but rather how to scale the resolution. S > On Nov 3, 2017, at 10:34 AM, Curtis Nichols = wrote: >=20 > PPI: pixels per inch. =20 > An inch of what? An inch on a 60" screen? An inch on an iPad? An inch = on a 40' projection screen? For HD, all of those are 1920 pixels = across. If you put a ruler to them you'll get a different ppi in each = screen. That'd be a silly thing to do, but it illustrates the point.=20 >=20 > Video is measured in pixels, not inches.=20 >=20 > And BTW, ignore the "video is 72 dpi" claim. Again, an inch of what? >=20 >=20 > On Fri, Nov 3, 2017 at 10:18 AM Rick Gerard > wrote: > No - you can=E2=80=99t blow up a 300 ppi image 4 times without loosing = quality in video or the web.=20 >=20 > The samples I showed you are exactly the same number of pixels. The = PPI only effects the size of the printed image on paper. They will both = look exactly the same on the web, embedded in an email, or in a video.=20= >=20 > PPI is completely irrelevant unless you are printing. That is what = controls the size of the printed image.=20 >=20 > If you are scanning a document then increasing the PPI will give you = more pixels per inch of document, but if the image originally is 100 = pixels by 100 pixels then the resolution is 10,000 pixels. PPI has = nothing at all to do with resolution in a digital image.=20 >=20 > PPI has everything to do with resolution when you are talking about = scanning or the size of an image sensor. When you are talking about a = digital display you don=E2=80=99t use PPI, you use dot pitch - how many = dots are there per inch. >=20 > I hope this helps. When working with images in Photoshop or even = creating vector artwork in Illustrator you should only be looking at the = number of pixels. The only time you need to pay attention to PPI is when = you intend to print that image on paper. >=20 > Hope this clears it up for you. >=20 >=20 >> On Nov 3, 2017, at 8:02 AM, Peter Matulavich > wrote: >>=20 >> Thanks Rick, it worked and how easy! While you don't need to worry = about PPI in the settings, it's good to know how many PPI were in the = original image so you know how much you can blow it up before losing = quality, right? In other words, a 300 ppi image can be blown up a = little more than 4 times. I don't often work with imagery that was = originally 300 ppi, so this really opens some doors when I do. >>=20 >> Thanks again. >>=20 >> Pete >>=20 >> = --------------------------------------------------------------------------= --------------------------------------------------- >>=20 >> If you goal is to resize the images so they are at least 1920 X 1080 = then do that by resampling the image Alt/Option + Ctrl/Cmnd + i, then = turn resample on and set the dimensions to pixels and enter 1920 or 1080 = in the smallest box. You don=E2=80=99t need to worry about the PPI = unless you plan to print the image. >=20 > --=20 > Curtis Nichols >=20 > > www.PCSProductions.com > O: (972) 550-8503 <> > E: curtisn = @pcsproductions.com = >=20 > = = = --Apple-Mail=_C71A3E4D-DE6F-4FBA-B3DF-15DBF150B408 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 an = inch is an inch. doesn=E2=80=99t matter where you measure it, its always = the same.

a better = way of expressing DPI / PPI : its a scaling factor saying how many = pixels per measure unit to use.  its not a measure of resolution, = but rather how to scale the resolution.

S

On Nov = 3, 2017, at 10:34 AM, Curtis Nichols <AE-List@media-motion.tv> wrote:

PPI: pixels per inch. =  
An inch of what?  An inch = on a 60" screen? An inch on an iPad? An inch on a 40' projection = screen?  For HD, all of those are 1920 pixels across. If you put a = ruler to them you'll get a different ppi in each screen. That'd be a = silly thing to do, but it illustrates the point. 

Video is measured in pixels, not inches. 

And BTW, ignore the "video is 72 dpi" claim. Again, an inch = of what?


On Fri, Nov 3, = 2017 at 10:18 AM Rick Gerard <AE-List@media-motion.tv> wrote:
No = - you can=E2=80=99t blow up a 300 ppi image 4 times without loosing = quality in video or the web. 

The samples I showed you are exactly = the same number of pixels. The PPI only effects the size of the printed = image on paper. They will both look exactly the same on the web, = embedded in an email, or in a video. 

PPI is completely irrelevant unless you = are printing. That is what controls the size of the printed = image. 

If = you are scanning a document then increasing the PPI will give you more = pixels per inch of document, but if the image originally is 100 pixels = by 100 pixels then the resolution is 10,000 pixels. PPI has nothing at = all to do with resolution in a digital image. 

PPI has everything to do = with resolution when you are talking about scanning or the size of an = image sensor. When you are talking about a digital display you don=E2=80=99= t use PPI, you use dot pitch - how many dots are there per = inch.

I hope = this helps. When working with images in Photoshop or even creating = vector artwork in Illustrator you should only be looking at the number = of pixels. The only time you need to pay attention to PPI is when you = intend to print that image on paper.

Hope this clears it up for = you.


On Nov = 3, 2017, at 8:02 AM, Peter Matulavich <AE-List@media-motion.tv> wrote:

Thanks Rick, =  it worked and how easy!  While you don't need to worry about = PPI in the settings, it's good to know how many PPI were in the original = image so you know how much you can blow it up before losing quality, = right?  In other words, a 300 ppi image can be blown up a = little more than 4 times.  I don't often work with imagery that was = originally 300 ppi, so = this really opens some doors when I do.
Thanks = again.

Pete

---------------------------------------------------------------= --------------------------------------------------------------

If you goal is to resize the = images so they are at least 1920 X 1080 then do that by resampling the = image Alt/Option + Ctrl/Cmnd + i, then turn resample on and set the = dimensions to pixels and enter 1920 or 1080 in the smallest box. You = don=E2=80=99t need to worry about the PPI unless you plan to print the = image.

--
Curtis = Nichols


www.PCSProductions.com
O: (972) = 550-8503
E: = curtisn@pcsproductions.com

    3D""          

= --Apple-Mail=_C71A3E4D-DE6F-4FBA-B3DF-15DBF150B408--