pictures .pmg to jpeg?

carlosinfl · 07-14-2004, 11:09 PM

When I save pics in my Fedora Core 2 distro I see they show up with a .pmg extension. Is there a way to convert them as jpegs or in the future save them as jpegs or does it even matter?

pave_spectre · 07-14-2004, 11:14 PM

What pictures are you saving?
Where are you saving from?
Did you check the image properties before saving? Are you sure they are jpeg files?

Are you sure its saving as pmg and not png?

carlosinfl · 07-14-2004, 11:21 PM

sorry - I am at work and dont have my PC infront of me - yes , they are png files and I just right click them from the internet and save to a folder - maybe I am not changing the extension. Is png default?

pave_spectre · 07-14-2004, 11:25 PM

If you check the properties on the files before saving you will probably find that they are png images rather than jpeg.

Unless for some reason you need them to be jpegs you can leave tham as is and they should work fine.

carlosinfl · 07-14-2004, 11:29 PM

when I go to a website and download a pic on my XP machine, it is a jpeg - when I download the same pic on Linux - its saved as an .png

will it effect the pic of I save the .png as a jpeg?

mlp68 · 07-15-2004, 12:28 AM

The swiss army knife for image formats is ImageMagick, which is a collection of command line tools that allow you to do virtually anything with images. The "convert" utility will do the trick --

convert file.png file.jpg

makes a jpeg out of a png.

It will also make any other from any other, by the way. Example, a screen shot:

xwd | convert - screen.jpg

xwd produces a dump file on stdout, we just pipe it into convert and get a nice jpg.

You can resize, crop, touch up, color transform, add text, superimpose some primitive drawings, produce animated gifs, you name it, it does it. Ever had to quickly make thumbnails of 1500 images?

Hope it helps,
mlp

miner · 08-19-2004, 09:00 AM

how do i batch resize with the convert command

for one photo i type in

Code:

convert 100_1191.JPG -resize 800x533 pic1.JPG

but i am clueless on how to do 25 at once. would it be

Code:

convert 10*.JPG -resize 800x533 pic1.JPG pic2.JPG pic3.JPG etc.....

mlp68 · 08-19-2004, 11:45 AM

Just make a little script, e.g. c.sh:

Code:

#! /bin/sh

# convert something.JPG into a smaller something_small.JPG,
# eg 100_1191.JPG --> 100_1191_small.JPG

for file in $* ; do

convert $file  -resize 800x533 `echo $file | sed 's/.JPG/_small.JPG/g'`

done

make c.sh executable - chmod +x c.sh

then do

./c.sh *.JPG

it will make smaller versions of the image with the new name.

Hope it helps,
mlp

miner · 08-19-2004, 12:06 PM

thanks, it worked.

shengchieh · 08-19-2004, 12:19 PM

Easiest way: Use

http://wheel.compose.cs.cmu.edu:8001.../browse/objweb

Sheng-Chieh