Re: changing resolution in PSP
by "R. Anthony Powell" <tony.powell(at)murraystate.edu>
|
| Date: |
Sat, 24 Jan 1998 12:02:13 -0600 |
| To: |
"C. Cyrny" <ccyrny(at)stuttgart.netsurf.de>,
"Steve Bassler" <bassmstr(at)westol.com> |
| Cc: |
<hwg-graphics(at)hwg.org> |
| |
todo: View
Thread,
Original
|
|
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-----Original Message-----
From: C. Cyrny <ccyrny(at)stuttgart.netsurf.de>
To: Steve Bassler <bassmstr(at)westol.com>
Cc: hwg-graphics(at)hwg.org <hwg-graphics(at)hwg.org>
Date: Friday, January 23, 1998 6:06 PM
Subject: Re: changing resolution in PSP
>Steve Bassler wrote:
>>=20
>>=20
>> What, exactly, does dpi mean, in the context of a jpg file? I know =
it
>> represents dots per inch for paper print, but that concept is
>> meaningless on a video screen.
>
>Actually, I'm somewhat confused about this, too. I tried to figure
>this out by calculating the ppi (I suppose this is the equivalent of =
dpi
>for graphics on the web) at different resolutions, but when I - just =
for
>kicks - took a JPEG file and saved it at 1 dpi (compression set to 10),
>much to my surprise it still looked ok! Can someone clear up this
>mystery?
>
dpi =3D dots per inch
ppi =3D pixels per inch
Image pixels are translated directly into monitor pixels. When an =
image's resolution is higher than the monitor resolution, the image =
appears larger on-screen than its specified dimensions. For example, =
when you display a 1-inch-by-1-inch image with a resolution of 144 ppi =
on a 72-dpi monitor, it appears in a 2-inch-by-2-inch area on-screen. =
Because the monitor can only display 72 pixels per inch, it needs 2 =
inches to display the 144 pixels that make up one edge of the image.
When You're Ready for a Website That Works
foreman(at)gashouse.com
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<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>-----Original Message-----<BR>From: C. =
Cyrny <<A=20
href=3D"mailto:ccyrny(at)stuttgart.netsurf.de">ccyrny(at)stuttgart.netsurf.de</=
A>><BR>To:=20
Steve Bassler <<A=20
href=3D"mailto:bassmstr(at)westol.com">bassmstr(at)westol.com</A>><BR>Cc: =
<A=20
href=3D"mailto:hwg-graphics(at)hwg.org">hwg-graphics(at)hwg.org</A> <<A=20
href=3D"mailto:hwg-graphics(at)hwg.org">hwg-graphics(at)hwg.org</A>><BR>Date=
: Friday,=20
January 23, 1998 6:06 PM<BR>Subject: Re: changing resolution in=20
PSP<BR><BR></DIV>
<DIV></FONT>>Steve Bassler wrote:<BR>>> <BR>>> =
<BR>>> What,=20
exactly, does dpi mean, in the context of a jpg file? I know=20
it<BR>>> represents dots per inch for paper print, but that =
concept=20
is<BR>>> meaningless on a video screen.<BR>><BR>>Actually, =
I'm=20
somewhat confused about this, too. I tried to figure<BR>>this out by=20
calculating the ppi (I suppose this is the equivalent of dpi<BR>>for =
graphics=20
on the web) at different resolutions, but when I - just for<BR>>kicks =
- took=20
a JPEG file and saved it at 1 dpi (compression set to 10),<BR>>much =
to my=20
surprise it still looked ok! Can someone clear up=20
this<BR>>mystery?<BR>><BR> </DIV>
<DIV> </DIV>
<DIV>dpi =3D dots per inch</DIV>
<DIV>ppi =3D pixels per inch</DIV>
<DIV> </DIV>
<DIV>Image pixels are translated directly into monitor pixels. =
When an=20
image's resolution is higher than the monitor resolution, the image =
appears=20
larger on-screen than its specified dimensions. For example, when =
you=20
display a 1-inch-by-1-inch image with a resolution of 144 ppi on a =
72-dpi=20
monitor, it appears in a 2-inch-by-2-inch area on-screen. Because =
the=20
monitor can only display 72 pixels per inch, it needs 2 inches to =
display the=20
144 pixels that make up one edge of the image.</DIV>
<DIV> </DIV>
<DIV align=3Dcenter><A href=3D"http://www.gashouse.com"><IMG =
align=3Dbaseline=20
alt=3Dgashouse border=3D0 hspace=3D0=20
src=3D"cid:001201bd28f2$328956a0$9e0c53c6@orson"></A></DIV>
<DIV align=3Dcenter><FONT color=3D#000000 size=3D2>When You're Ready for =
a Website=20
That Works</FONT></DIV>
<DIV align=3Dcenter><A href=3D"mailto:foreman(at)gashouse.com"><FONT =
color=3D#000000=20
face=3D"" size=3D1>foreman(at)gashouse.com</FONT></A></DIV></BODY></HTML>
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