May 10th, 2003, 10:29 AM #1
- Join Date
- Oct 2001
Reduction of JPG image size in PS7.0?
I have some JPG images I made with my digicam, they are too big in size to be placed on the web (+/- 780K).
I heard that there is an automation function in Photoshop 7.0 to reduce all images in a given folder, so that one does not have to do this one by one and by hand?
Does anyone know how it works?
Basically I want them to remain in JPG format and save them in Quality level 5 (This would reduce a 780K JPG to about 160K +/-).
May 10th, 2003, 10:35 AM #2
If you had Windows XP, you could just use the Image Resizer Power Toy.
You can select a bunch of images at once, and then resize them all together.
I know it's not the answer to your Photoshop question, but it might get you by until somebody comes along and answers it.
May 10th, 2003, 11:30 PM #3
I would use ThumbsPlus for a job like this. In fact I always use ThumbsPlus for making my JPG files. This is because I've tested quite a few programs to see how well their JPG compression fairs against each other. I tested Photoshop ability to make JPGs in with'em also.
End result of that test? I never use PS to make JPGs anymore. I will save my PS image as a PNG usually, or just as native PSD format...then I'll use ThumbsPlus to view that PNG or PSD and then I'll save as JPG. Without fail, Thumbs+ will produce a smaller file size but more importantly, it also makes JPGs of a substantially higher quality. Smoother, less artifacts.
Thumbs also gives you much more control over the compression method used in the JPG.
Thumbs+ will easily process batch jobs of hundreds or even tens of thousands of images all by itself. You just gotta set it in motion.
Do you still have Thumbs+ CM? I know you did at one time. Setting it up to run a large batch job is pretty straightforward...but if ya need any help just ask and I'll give ya some details on the steps involved.
What's nice is that once you setup the processing that is to be done in the batch job, you can just save that job. Then in the future when you again have a directory full of digi pics you won't need to re-setup the batch processing stuff. You can just run the saved job and it'll do the same proceedure on your new pics as it did on the old ones.
blah, blah, blah, I'm rambling on. Can you tell Thumbs+ is one of my fav apps?
May 11th, 2003, 12:18 AM #4
**Removed** Misread the question
Last edited by VHockey86; May 11th, 2003 at 12:21 AM.
May 11th, 2003, 04:18 AM #5
Well, if you do still have Thumbs+ CM, then here is how to run a batch
process to make it resave all the files in the current directory as
50% quality JPG files.
This next step, the "Batch Steps" tab, is where you'd instruct it to
perform other modifications on the files if you so desired. For
example, if you also wanted to resize the images to be smaller or crop
them or add a border to them or make color adjustments, or whatever...
This is where you can do those things.
But if all you want to do is resave the images as 50% quality JPGs
then the last tab, "Output Details", is where you need to go. First
choose your output format...JPG.
Soon as you click that it'll pop you into JPG options dialog box.
Here's where you control the quality of the compression.
I almost always leave the "smoothing" slider at 0. If I do decide
to use smoothing I keep it low, like 10 or maybe 20%. You can also
choose your "sub-sampling" type if you wish. Here too I usually just
leave the sub-sampling at "1:1 best quality". If you try the lower
quality ss levels you'll probably find that the output file sizes are
not much smaller but very quickly you'll begin to notice how poor the
compression quality is at those other SS levels. The size/quality
trade-off is most often not even worth the effort...hence that's why I
just leave it 1:1.
Now, if you want the end result to simply be that your current large
files keep their same names and just become smaller files (from the JPG
compression), then you'll want to take note of the first two highlighted
boxes and set yours the same. The last highlighted box there is where you
can save all the settings of this batch process if you wish. Then next
time you need to use it all these same variables will be recalled and all
you'll need to do is click "ok".
May 11th, 2003, 10:12 AM #6
- Join Date
- Oct 2001
Hey OuT I am always impressed by your tutorials, and also very thankful for the time and effort you put into them.
Unfortunately I don't have Thumbs+ anymore, but I found out that one can use ACDSee 5.0 to change the compression of JPG's. At the moment it's working quite well, I was able to bring down the size of about 20 images (35MB) down to about 5.17MB.
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