#3ds ratio
11 messages in this thread
kevin, what would the aspect ratio be for a 4096×4096 targa file in
3dstudio? thanks
Sherwood, depending upon how much free hard disk space you have on your 3ds
disk partition, plus RAM, a 4Kx4K file could take alot of memory to render.
For example, without a rescaled background, it would take over 64
Megabytes… up to 80 Megabytes with some geometry and a small shadow
map… 140 Megabytes with a rescaled background, etc etc.
We've gotten tremendous results with high antialiasing on 2K images. In
fact, the current cover of Cadalyst magazine (December issue with the bowl
of fractal soup), is done in 3DS at 2048×1536. You should pick up a copy;
it's one of the best computer graphics covers I've ever seen. (it's just
hitting the stores late this week)
If you haven't read 3DSRAM.DOC in DL9, check it out.
– G
PS: The aspect ratio for imaging to film is almost always 1.0, no matter
what the output resolution. 2048×1536 is the most common 35mm slide output
res.
thanks Gary , i will try the 2k targa first and see what imageset can do
with it
sherwood
Sherwood, you might also check COlossal Graphics in San Jose or Master
Blueprint in Minneapolis I believe. I have had several of Brett's (our fine
artist) images printed via Versatec electrostatic plotter and they are
quite nice, but the colors aren't as rich as a photo would be naturally. I
am looking for a list of large-format-targa-printing houses. Could you give
me some details on Imageset? Thanks…
sure, i talked to them yesterday and they were quite friendly and
knowledgeable about the process that it takes to print a targa file
photorealistic. they are located in san fran. (415-626-8366) they are going
to take my targa file on tape and color process it to a 4×5 neg and a 35
mil slide. they like to use both because the 35 mil slide gives the print
shop a reference as to how the final print should look. since this is my
first time in doing this kind of thing i'm looking forward to seeing the
results.
there is another company that is called iris graphics that i hear can take
a targa directly and print out a large 24×36 inch print. but im not sure
what they use. i think brilliant image in new york is installing one of
these in january.
sherwood
My wife and I are planning a high-end computer fine arts business and are
looking for a reliable output center. I will check them all out… Thanks
Gary-
Why is 2048×1536 a "common" slide resolution? I'm surprised that this
represents a 4:3 ratio. I thought 35mm was 3:2.
–Noah
Good question… I don't know why, but this is the resolution that all the
slide service companies have told me to give them!
Anyone else know the answer to this?
– G
Gary,
Well, heck, nobody asked me…! And by the time I'm finished,
you'll remember why. I think the confusion originates because of the
differences between screen ratio, file ratio & film ratio.
Work on an image in the same screen proportions as the film ratio. 35mm is
a 1.5:1 ratio (or 3:2) & 4×5 film is 5:4. A .TGA image of 512×482 on a
monitor is 4:3 (hey, nobody said we're always using square pixels).
Output to 35mm film would be 512×342 pixels, or a multiple (1024×684 or
2048×1368). For 4×5 film, use 512×384 (or 1024×768 or 2048×1536). I hope
this explains the common use of 2048×1536 by service bureaus.
You can also FIT (leave unexposed areas surrounding left & right sides) or
CROP (leave off some information on the top and bottom of your image) for
other formats. In traditional photography, to print a 35mm negative onto
8×10 paper, you either crop off some of the negative, or print the entire
negative onto the paper, leaving some of the paper surrounding the negative
unexposed.
We could also go into film density (2k resolution on 35mm is 2048 pixels
per row measuring 1.5 inches, equal to 1366 pixels per inch, on 4×5 it's
2048 pixels over 5 inches, thus a pixel density of 410 per inch). A pixel
on 4×5 film is roughly 3.3 times larger than the same resolution on 35mm
film. The image begins to look "blocky". To get the equivalent of 2K 35mm
quality on a 4×5, you need an 8K file, for 8×10 you'd need 16K to maintain
a high level of pixel density. So I hope the Yost Group's lab has a Forte.
May I recommend the book I "stole" all this from: Basic Digital
Photography by Norman Breslow (a CSA customer, of course) from Focal Press,
available in many technical book stores. Published by
Butterworth-Heinemann, 80 Montvale Ave., Stoneham, MA 02180.
Kevin Krell – Computer Support Associates
Kevin-
excellent. thanks.
–Noah
Sherwood,
Might as well make it 1:1 (aspect 1.0). Gary makes some good points
re: memory requirements. Might as well choose a resolution that matches
the output type (2K x 1.5 for 35mm, for instance). If you can use 4K x 4K,
well, by all means, go ahead.
Kevin Krell – Computer Support Associates