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View Full Version : jpg compressions?

krzkrzkrz
10-05-2006, 10:21 PM
My photos are usually 3Mb at medium quality.

When I upload my photos onto an online service (i.e. www.multiply.com, www.picasaweb.com, or other) I realise that the file size is a LOT smaller, roughly 200Kb. When I compare the two images together, I see that the resolution are the same, and can't really tell much difference in quality. I might be wrong here.

Are there any software / programs that will enable me to lower the file size of my images once they are imported onto my computer / laptop? Perhaps a similar method to what the online services are using?

If so, will this have any disadvantage on the quality of the pictures?

I know about zip, rar or other compression methods. But these are mostly used to compress a batch of files.

Regards,
Krz
forno
10-05-2006, 10:28 PM
What resolution is your monitor;)
krzkrzkrz
10-06-2006, 12:06 AM
Hey forno,

Laptop has a 1920 x 1200 :)
forno
10-06-2006, 12:13 AM
so why would you ecpect 2 photos to view differently?

Provided their resolution is higher than that
krzkrzkrz
10-06-2006, 12:36 AM
so why would you ecpect 2 photos to view differently?

Provided their resolution is higher than that

Ah, I thought it may have affected the pixel count or what not. Guess I misunderstood then.

Any ideas for compressing an image file to have a smaller size? :)
Otherwise, I would have to upload all my photos, then download them again. Which is pointless, but has its valid motive
David Metsky
10-06-2006, 08:56 AM
Most image manipulation software (PhotoShop, for example, but all of them) allow you to set the JPG compression rate when saving an image. Experiment a bit and find the best combination of size vs quality that works for you. Keep in mind that viewing on a monitor can take a lot more compression without showing artifacts than printing on paper.

-dave-
GaryS
10-06-2006, 09:42 AM
If you want to see the difference yourself, try printing two 5x7s. First one from your original 3mb file, and the second one for the 200k file that was on the website. They will look very different.

On a monitor, even a 800x600 photo will look ok. Good even. But if you print it out, it will look awful.
krzkrzkrz
10-08-2006, 08:06 PM
A friend of mine suggested a program called ACDSee, which allows you to select a folder and covert all images on that folder.

I knew about Photoshop, but if I had to do this process for each and everyone one file, then it would just take most of my time
forno
10-08-2006, 08:17 PM
A friend of mine suggested a program called ACDSee, which allows you to select a folder and covert all images on that folder.

I knew about Photoshop, but if I had to do this process for each and everyone one file, then it would just take most of my time

Whats wrong with DPP software that came with the camera??
krzkrzkrz
10-08-2006, 08:22 PM
Whats wrong with DPP software that came with the camera??

Forno, Digital Photo Professional can convert a folder of images to be in smaller size? i.e. from 2.5Mb to ~ 200Kb?
forno
10-08-2006, 08:58 PM
Forno, Digital Photo Professional can convert a folder of images to be in smaller size? i.e. from 2.5Mb to ~ 200Kb?

Yes it can, but all thios begs the question. Why buy a 8MP DSLR when you want to knock all the files down so low, a 3MP camera would have been fine
krzkrzkrz
10-08-2006, 09:25 PM
Yes it can, but all thios begs the question. Why buy a 8MP DSLR when you want to knock all the files down so low, a 3MP camera would have been fine

Most of the time I'm shooting for fun, or just shooting for random casual events. For these pictures, I dont mind reducing the size of.

Other times, Im shooting pictures that I really like or would like to keep for printing / post-processing / or just viewing. For these pictures, I would like to keep their respective image quality and size