Shrinking a picture --- and it becomes blur !!

wrote:
When I am satisfied with a certain creation, I often make a master
copy with the resolution of 8192 X 6144 pixel. Why that size? Because
that's the largest size my puny computer (dual-core 3GHz CPU running
XP with 4GB RAM) can produce within a reasonably timeframe. (Give or
take 8 hours for rendering).

You should render it to the size you're going to use. And then it'll only
take a few minutes to render. You can always render it to a different size
if needed.

snip: saves as jpeg
However, I found that when I do that, many interesting minute details
that were in the 8K X 6K pictures (even when I shrink fit it to my
1024X768 desktop as wallpaper) are GONE.

That's what jpeg compression does. It is a lossy compression method.

How about saving as a png? It may not produce files as small as jpeg, but
the images will not be blurred (assuming you don't use jpeg compression in
the png!).

Andrew

If you are creating graphics from scratch, that is not from a camera of any
kind, then consider making your important detail in a vector drawing
program. If you can and if it works visually. Vectors will display as the
very best possible given the resolution of the display in use. (Look at US
paper currency under magnification. The engraving could be vectors.)

I have not read nor seen anyone 'mixing' a vector image after scaling with a
scaled raster image. The outcome will be a raster image with punctuations of
very fine lines of detail and even colors (where the colors are unitary).

(Didn't Steve Jobs' R&D people have postscript display in their neXt OS?)

What an idea. I will explore it beginning tomorrow. My current grant runs
out at 5PM today and I will be free for a week or so to use all this neat
stuff for pure play. I mean research.

In article , Pico wrote:

(Didn't Steve Jobs' R&D people have postscript display in their neXt OS?)

nextstep/openstep used display postscript and os x uses pdf.

nospam wrote:
In article , Pico wrote:

(Didn't Steve Jobs' R&D people have postscript display in their neXt OS?)

nextstep/openstep used display postscript and os x uses pdf.

Sun's NeWS also used PostScript. All a bit
moot now. These days you would use SVG.

--
Regards,
Martin Leese
E-mail: LID
Web: http://members.tripod.com/martin_leese/