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help - compression problem

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  #1  
Old 02-10-2002, 12:43 PM
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cendres cendres is offline
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help - compression problem

Hi,
I am using photoshop 6.0 and my camera outputs roughly a 2 mg jpg file at a size of 2560 x 1920 based on the settings I use in my camera. Picture quality is set at fine (highest)

When I open up a picture in photoshop generally all I need to do is a levels adjustment and I adjust contrast in that screen as well.

Once that is done I am prompted to save the file with the new adjustments. I do that and then when I look at the size of the file it is only 450 kb after the save.

I am not changing image size at all.

I know their must be a setting that adjusts the amount of compression when saving a jpg. file, and the compression is probably set to high. But I cannot find where to adjust this setting.

Could someone please help me on this one?

Thanks - Carl
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Old 02-10-2002, 01:21 PM
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DJ Dubovsky DJ Dubovsky is offline
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Don't you get a little box that comes up when saving it, that is titled JPEG Opions? If so there is a slider that you move to the furthest point to the right to set the least amount of compression. If I were you I would choose "save as" then select the jpg format and the box should come up when you hit save. Hope that helps. It could be that somewhere down the line you saved something in a low res jpg format and that setting stays the same until you readjust it. Let me know if that helps.
DJ
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Old 02-10-2002, 01:34 PM
George George is offline
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I tried to duplicate what your doing, by opening a similiar type 2.3 Meg jpg file from digital camera, then after making level adjustments I selected file save and it saved back as 2.3 meg jpg. Are you going to file then save?

When I use the jpg option in my digital camera I open the file in Photoshop, then save as a tif file. This allows me to open and close the file without any more loss than that I got from the camera to the first opening of the file.
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Old 02-10-2002, 03:01 PM
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DJ Dubovsky DJ Dubovsky is offline
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Saving as a Tif would have been my first recommendation since it's a much better way to save a photo file. But I thought you chose to save as JPG for some reason and went on that.

Yes, I do go to File > Save As.....etc
DJ
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Old 02-10-2002, 03:06 PM
George George is offline
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DJ

I meant to address that reply to Cendres, sorry I was not clear.

I could not duplicate what was happening to him, just was wondering if he used File then Save?

Yes I get them over to TIF just as soon as I can.
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Old 02-10-2002, 03:22 PM
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DJ Dubovsky DJ Dubovsky is offline
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Carl
Forget my previous post. A slight confusion there.

George
I didn't even see your name in the reply so I just thought you were Carl answering my last post. Guess we both got a little surprise there. Teach me not to pay more attention.

OH well, the moral of the story here is save as a Tif and forget the Jpg.
DJ
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Old 02-10-2002, 03:56 PM
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Carl, Thats normal for PS to do that. I have some JPEG digital photos stored which are 3.99 mb when open, when stored are below 1 mb. There is no deterioration of image quality, and is simply the compression scheme PS utilizes, but, its best to save as TIF. I only keep some as JPEG because a couple of programs I use will only operate with JPEG format stuff. Tom
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Old 02-10-2002, 09:11 PM
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cendres cendres is offline
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Hey Everyone,

Sorry it has taken me so long to reply, we had a hockey game to go to today.

First let me reconfirm a couple things on how I work with the files in general.

#1) I take the images from my camera and put them into a folder on my hard drive. If I explore and find the image, it tells me it is roughly 2 mg.

#2) I then open photoshop, do a file open and browse to the image and open it. At this point it is still a jpg file, not a PSD. I do the quick and dirty levels/contrast adjustment. Once that is done, I hit file save. There is not any windows that come up at all, it just closes the image window.

#3 If I do a file save as then of course I have the option to save it in various formats including tiff. I generally do not do this because than I would essentially duplicate the file. There is no slider to adjust jpeg compression in this window.

#4 Remember I am using Photoshop 6.0 I would be curious to know if DJ, George and Thomas George are using that version or an older version.

I did find one area where I can adjust jpeg compression, In PS 6.0 if you go to file - save for web. A box opens up and there is a area that you can adjust compression. I did not have time to play around with it (and still haven't) but maybe that is the problem. I just don't understand why they would bury JPEG compression settings there and not in the preferences portion.

Thomas, maybe you are right and thats just the way photoshop saves jpeg files, but it would seem odd that it would lose such a large portion of the file size without me reducing the actual size of the image.

I used to use Paint Shop Pro and when you did a file save, there was a setting to adjust the amount of compression. If you did not change that setting, it would just default to your last setting you had made.

I fully recognize that tiff is the way to go, but I only have 2 gb left out of 15 and my camera would make each of these pictures 15 mb each. I take a ton of pictures, but only print less than 10% if that, so I really would like to keep them in JPEG if possible.

Thanks to everyone for taking the time to read this long followup. If you do have PS 6 I would be curious if you can find out something I havent yet. I will work on this tomorrow and will get back to everyone to see if I can figure anything else out.

Carl
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Old 02-10-2002, 09:34 PM
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DJ Dubovsky DJ Dubovsky is offline
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Carl
First of all, I am running Photoshop 6 same as you. I tried to duplicate your problem but my file size remained the same. I did however notice that the JPEG Options dialog box did not come up when I chose File > Save. It just saved it. However when I saved it going File > Save As, I did get the dialog box. If you don't want the image to be duplicated doing it this way then all you have to do is leave the file name the same and it will ask you if you want to replace it. Hit yes and the JPEG dialog box comes up. However, for safety sake I wouldn't do that until you see that it doesn't affect your only copy. If by creating a duplicate file you see that they are the same size then try over writing the file.

Since I did not get the same compression results you did, I can't say that this will be a fix for you. If I were you I would consult Adobe on the subject or if you belong to NAPP there is a great help desk on their website with quick answers to your problem. Something doesn't sound right. Good luck and don't forget to let us know what you find out.

Just a note here from experience, it is a good idea to have another copy of those files besides on your hard drive. Hope you back them up. I got caught a few times and that don't feel good.
DJ
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Old 02-10-2002, 09:44 PM
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DJ Dubovsky DJ Dubovsky is offline
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Carl,
I reread Toms post and I realized what you were probably refering to. That same photo I opened as a JPEG was a file size in Photoshop of 3.2MB but when I view it in Windows Explore it is only 981KB. Is that what you're refering to? If so that is normal. If I open that same file Photoshop will still say it is 3.2MB. I never quite understood that but it is normal as Tom says. Maybe someone can explain why that is exactly.
DJ
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