ltcommander

Hi all,

We have a requirement from a client to batch convert EPS and TIFF files
to 120 DPI GIF and JPEG files. The problem we face is that we do not
find an option to save the GIF in 120 DPI. We only see a maximum of 72
DPI.

1) Can this be done in Illustrator (save EPS, TIFF -> 120 DPI JPEG /
GIF). If it can be done, I am sure it would be possible to script it
using VBScript (we have a Windows version of Illustrator as well)

2) This is slightly off topic, but if Illustrator cannot do this, can
somebody please suggest an alternative software that will be able to:

a) Convert EPS, TIFF to 120 DPI GIF (Image Alchemy doesn't do this
either and the size of the converted image becomes greater than the
original image at the maximum 72 DPI possible)

b) Feature a command line interface so that we could program the
software to suit our needs. We would need to be able to read the
resolution, dimensions of a TIFF / EPS file and convert it to GIF / JPG
accordingly. So, a TIFF (say) 5" wide would be processed differently
from a TIFF that's 10" wide. If the dimensions, resolution can be
revealed using a command line function, that'd be awesome!


of this, especially processing EPS files. I have tried GFX Alchemy, Rea
Convertor, Illustrator and so on. Rea Convertor provides the command
line functionality but the quality of conversion is not good.

Would be grateful for leads / advice.

Thanks a lot.

Vince

inez

On 9/26/06 5:49 AM, LtCommander@gmail.com commented:

AFAIK, this will be the outcome with any software because GIF is
specifically meant for screen *pixel* resolution only, thus your original
will be *enlarged* to 120PPI screen dimensions.

My question is: what's the reasoning given by your client for these
conversions? Your client probably isn't educated in graphics and most likely
has faulty info and/or understanding on the subject and may need educating.
These specs may have been given to them by a web designer, screen printer,
etc. who didn't communicate their needs thoroughly or well, or your client
misunderstood. Alternatively, your client might have a do-it-yourself
project in mind and is bit clueless. So, what are the images for?

inez

steggy

Not sure what you or your client want to achieve either, but Photoshop
does it.

steg

ltcommander

Thanks for that!

They want a 120DPI GIF resolution for displaying on the web. As evident
as it is, I am not well versed with graphics either. I do the IT work
and this "requirement" was given to us by our customer service
department! If 120DPI can't be done, how would Photoshop do it?

Vince

fungusized

Web resolution is 72 dpi. ALWAYS. No matter what dpi you save it at, web
browsers will automatically default GIF's to 72 dpi. Saving it as
anything but will make it look terrible online (since the browser will
have to resize it, which is never a good thing).

inez

On 9/26/06 8:04 PM, LtCommander@gmail.com commented:

Customer service is setting your web graphic specs?!

Well, screen display resolution is stated in pixels per inch, not dots per
inch. Fungus is correct. If you save a 1" X 1" image at 120ppi it will
display in a browser with the dimension of 120pixels X 120pixels, or 1.667"
X 1.667". Sure, they could force fit the image to original size in coding,
but they'd be making the browser resample the image while the larger file
size causes a slower load for no good reason.

I'm afraid I'd have to question the logic in this. Hey, maybe they know
something I don't; happens all the time

inez

inez

On 9/26/06 10:09 PM, inez commented:


I should amend this by saying that the above stated dimensions will be
relative to the viewer's monitor resolution; a variable none of us have
control over.

steggy

Again it all depends.

Making a PDF for the web is different for instance. Sometomes it helps
to higher the resolution of graphics and the browser/screen/computer can
not touch that.

But it is true. 120DPI is a crazy assumption for direct web. Even 5 DPI
is enough

For Vince: no clue how Photoshop does it, Photoshop just gives that
opportunity. I can imagine that is for being prepared to do something
in ImageReday or whatever. No clue. Again: for web (not speaking about
PDF and such) it is totally unnecessary. And since Illustraor is vector
not raster, it has very little to do with DPI or wha have you. I'd say
go back to customer service or better yet: give them oinm screen a 72
and a 120 DPI and a 5 DPI sample.......no difference.

inez

On 9/27/06 5:15 PM, steggy commented:


I have to admit, Steg, that I have no idea what you mean by the above in
relation to GIF and JPEG for the web.

inez

fungusized

BUT!

You'd have to "save as" to maintain the resolution like that. If you
choose "Save for web", Photoshop automatically adjusts the resolution
for 72ppi.