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jpeg compression

J

Joe G \(Home\)

Jan 1, 1970
0
Hi All,

I want to take a simple JPEG file on a PC and compress it say in to 320x240
B&W file.

What steps do I need to take?

Where can I get the JPEG std file format?

What challengers do you think I need to meet?


Regards
Joseph
 
B

Ban

Jan 1, 1970
0
Joe said:
Hi All,

I want to take a simple JPEG file on a PC and compress it say in to
320x240 B&W file.

What steps do I need to take?

Where can I get the JPEG std file format?

What challengers do you think I need to meet?


Regards
Joseph

You can do that with paint, with the shrink/stretch function, but you have
to calculate the percentage. Also the B/W conversion is faulty in paint.
I use the free screen capture program 20/20
http://www.sofotex.com/20/20-download_L230.html
for this kind of stuff. It also converts .bmp to .gif, extremly useful for
circuit diagrams.
 
J

JeffM

Jan 1, 1970
0
I want to take a simple JPEG file on a PC and compress it
say in to 320x240 B&W file.
Joseph -- Joe G (Home)

The Swiss Army Knife of graphics programs for Windoze
is a freeware app called IrfanView. http://www.irfanview.com

Image; Convert to greyscale
Image; Resize
File; Save as
 
R

René

Jan 1, 1970
0
The Swiss Army Knife of graphics programs for Windoze
is a freeware app called IrfanView. http://www.irfanview.com

Image; Convert to greyscale
Image; Resize
File; Save as

Same here, I have Photoshop, but use Irfanview 95% of the time for
light conversion work (also batch conversion!)
 
Q

qrk

Jan 1, 1970
0
Hi All,

I want to take a simple JPEG file on a PC and compress it say in to 320x240
B&W file.

What steps do I need to take?

Where can I get the JPEG std file format?

What challengers do you think I need to meet?


Regards
Joseph

http://perso.wanadoo.fr/pierre.g/xnview/endownload.html

Or, you can use a subset of XNVIEW which is NCONVERT on the same site.
Nconvert is a command line converter, perfect for batch jobs/scripts
and calling from other programs. Cost: free. Works on most common
operating systems.

Since nconvert is hard to figure out, here is a starter for you:
nconvert -grey 256 -resize 320 240 -out jpeg -o OutName.jpg InName.jpg

You many want to set the compression level (-q) as the default is best
quality.

===
Mark
 
Y

YD

Jan 1, 1970
0
Hi All,

I want to take a simple JPEG file on a PC and compress it say in to 320x240
B&W file.

What steps do I need to take?

Where can I get the JPEG std file format?

What challengers do you think I need to meet?


Regards
Joseph

The GIMP. Really good but hell on wheels to get to grips with at
first. It's cheap too, like in freeware.

http://www.gimp.org/windows/

While you're there have a gander at the docs and tuts, you'll need
them.

- YD.
 
B

Buddy Smith

Jan 1, 1970
0
Joe G \(Home\) said:
I want to take a simple JPEG file on a PC and compress it say in to 320x240
B&W file.

If you want to do it yourself out of curiosity, I'd start by looking at
jpeg-6b from IJG.

You can get it here:
ftp://ftp.uu.net/graphics/jpeg/

It compiles in windows and unix/linux/etc.
What steps do I need to take?
Where can I get the JPEG std file format?
What challengers do you think I need to meet?

If you want to implement it yourself, it's quite complex. I'd start with
reading the docs and looking around jpeg-6b. btw, most JPEGs you get
are in "JFIF" format.

--buddy
 
N

Norm Dresner

Jan 1, 1970
0
If you have a not-too recent copy of Microsoft Office (up to Office XP but
not 2003), there's a program called Microsoft Photo Editor that comes with
it that does a dandy job of resizing image (including JPG) files, among
other things.

Norm
 
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