Newbie needs help on JPEG images

DG
Posted By
David Gintz
May 11, 2005
Views
473
Replies
6
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Closed
Hi All:

Having just scanned many 35mm slides at 4000 DPI into high quality JPEGs, I now want to know how to best change these images for smaller file size (and faster access time) for display on PC and eventual burning to DVD.

I’ve cleaned up and cropped all of the images in Photoshop 7 and like what I’ve got. I plan on keeping the high resolution versions for possible printing but wonder what would be a good setting for non-printing purposes.

What would you folks recommend I use? I assume that the way to do this would be to make some kind of batch process.

Anyone have any suggestions or set of actions to recommend?

Thanks.

– Dave
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C
CTLouisiana
May 11, 2005
Click on the File menu, select Batch Conversion/Rename. A dialog allows you to select a directory from which the files will be taken. Use Look in, File name, and Files of type to limit the search.

Select the output directory at bottom right. If you don’t have the full path for this directory, click the Browse button to find it. When you have selected a directory with Browse, find a directory and click the OK button.

You can set the current directory as output directory if you press the Use this directory as output button.

If you want to include all images from sub-directories, check the Include subdirectories option.
Batch Conversion:
Select the Output Format at bottom left. This works just like Save and Save As. The Options button lets you choose various operations to perform, also just like their Save and Save As versions.

Use the Advanced Options button to apply many special operations to the images during conversion. These options are much like their versions on the Image menu. The options are:

Crop, Resize, Insert text, Change color depth, Horizontal flip, Vertical flip, Rotate left, Rotate right, Convert to greyscale

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"David Gintz" wrote in message
Hi All:

Having just scanned many 35mm slides at 4000 DPI into high quality JPEGs, I now want to know how to best change these images for smaller file size (and faster access time) for display on PC and eventual burning to DVD.
I’ve cleaned up and cropped all of the images in Photoshop 7 and like what I’ve got. I plan on keeping the high resolution versions for possible printing but wonder what would be a good setting for non-printing purposes.

What would you folks recommend I use? I assume that the way to do this would be to make some kind of batch process.

Anyone have any suggestions or set of actions to recommend?
Thanks.

– Dave
T
Tacit
May 11, 2005
In article ,
"David Gintz" wrote:

Having just scanned many 35mm slides at 4000 DPI into high quality JPEGs, I now want to know how to best change these images for smaller file size (and faster access time) for display on PC and eventual burning to DVD.

Just as a side note: For images you intend to archive or to use later, JPEG is a bad choice.

JPEG works by deliberately degrading the quality of the image in order to make the file size smaller. It is intended for situations where file size is important and image quality is not important.

This degredation is cumulative and irreversible. If you open one of your JPEGs, make any changes to it, and save it as JPEG again, the image is degraded even more, and the quality goes down. Make additional changes and re-save it and the quality is degraded still more.

For images where you care about quality, especially images you intend to archive for future use, save in a format that is not degraded, such as TIFF.

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CF
Craig Flory
May 11, 2005
I agree about saving as a .tif file and only using .jogs for sending over the net to others as well as to a color lab for printing. I wanted to point out two things. First of all you are scanning in ppi’s and not dpi’s. PPI is pixels per inch and DPI is dots per inch. We work in ppi in photoshop. Secondly, 4,000 is extremely excessive. I’m a professional photographer. My color lab wants images that are 250 pixels per inch. So 4,000 is much more than you need for pinting, at an outside lab. And ink jet printers need even less. I’d suggest scanning at a max of 400 ppi.

Craig Flory
AM
Andrew Morton
May 11, 2005
I agree about saving as a .tif file and only using .jogs for sending over the net to others

I believe the files might go faster if you saved them as .runs or, for that last-minute correction before it goes to press, .sprint

I’ll go home now.

Andrew
J
Jim
May 11, 2005
"Craig Flory" wrote in message
I agree about saving as a .tif file and only using .jogs for sending over the net to others as well as to a color lab for printing. I wanted to
point
out two things. First of all you are scanning in ppi’s and not dpi’s. PPI
is
pixels per inch and DPI is dots per inch. We work in ppi in photoshop. Secondly, 4,000 is extremely excessive. I’m a professional photographer.
My
color lab wants images that are 250 pixels per inch. So 4,000 is much more than you need for pinting, at an outside lab. And ink jet printers need
even
less. I’d suggest scanning at a max of 400 ppi.

Craig Flory
The OP needs to determine the maximum size of print that he will ever need. Then, and only then, he can determine the number of pixels that his scanner should output. 4000 dpi (that is scanner speak for pixels per inch), while not extremely excessive, may be more than he will ever need (unless he wants to make some very big prints).
Jim
TT
Tom Thomas
May 11, 2005
"Craig Flory" wrote:

Secondly, 4,000 is extremely excessive. I’m a professional photographer. My color lab wants images that are 250 pixels per inch. So 4,000 is much more than you need for pinting, at an outside lab. And ink jet printers need even less. I’d suggest scanning at a max of 400 ppi.

He’s talking about scan resolution, not print resolution. He’s scanning 35mm slides. 4000 ppi scan resolution is not at all excessive for an original that is less than 1.5 inches in the largest dimension.

To quote from Wayne Fulton’s excellent www.scantips.com,

"For example, a full frame 35 mm color negative scanned at 2400 dpi will be about 3400×2200 pixels, and about 22 megabytes. Scanning at 2400 dpi and printing at 300 dpi allows enlarging that printed image 8 times more than the original film size (2400/300 = 8). Scaling by 8, so that the 1.4 x 0.9 inch film size (36 x 24 mm) prints 8X larger gives 11.2 x 7.2 inches. It will look great in regard to detail if printed at 200 to 300 dpi (assuming the printer can handle it). Scanning film originals can support this level of detail. Scanning a 6×4 inch photo will not. "

——————
Tom

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