On Apr 29, 4:39=A0pm, hsyq...@[EMAIL PROTECTED]
wrote:
> Hello !
>
> I do computer graphics as a hobby, and have produced quite a number of
> stunning graphics. Often time though, when I shrink the graphic to put
> them online, they become blurred !!
>
> I do all kinds of computer graphics, from fractals to virtual
> landscape, to sci-fi rendering, using softwares ranging from photoshop
> to terragen to povray.
>
> 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).
>
> As the filesize for a JPG with 8192 X 6144 resolution may go up to 30+
> MB, I often have to shrink them to a more reasonable 1024 X 768,
> filesize about 800 KB or so.
>
> 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. In the 1024 X 768 JPG files,
> all those details become blurred. No matter it's a JPG ---> JPG
> shrink, or BMP ---> JPG shrink, or TIFF ---> JPG shrink, all those
> details are GONE !!
>
> I have experimented with many different graphic / photo softwares in
> the shrinking process, all of them give me the same "blurring" effect.
>
> Now my questions to all you Gurus as below ---
>
> 1. =A0 =A0 =A0 =A0 =A0 =A0 =A0Can you tell me of the best way to shrink
a =
8192X6144 size graphic
> to
> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 1024X768 size graphic without losing the
i=
nteresting details?
>
> 2. =A0 =A0 =A0 =A0 =A0 =A0 =A0Which software do you recommend to carry
out=
the shrinking
> operation?
>
> Thank you all in advance !!!
>
> Sincerely,
> Lee
As advised, rendering to the size you want may be the best way.
Or try the "Lanczos" algorithm - eg in Irfanview. Also, downsizing in
steps may work better, in other words, try reducing in steps of say
20% (or even less), and then experiment with light sharpening (USM) at
each step - Irfanview has this function built in, but I can usually do
a little better manually. I've found what works for some images,
doesn't work as well for others.. and I've never experimented with
rendered images, so all this may be useless... (O:
The best you can hope for is one/two-pixel sharpness, so maybe you are
expecting too much?
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