Editing an image -- a couple of basic tips:


If your software did not let you pre-scan, crop the image. Rotate it if needed. Adjust brightness, contrast, colors, sharpness, etc. Compare it with the original. Adjust the scan settings and rescan it if it differs too much in size or color or .....
Slides that need editing after having been scanned

Save as:
myimage1.jpg if your original has many colors
myimage1.gif if your original has black and white or grayscale only, or fewer colors, or you need transparency.
Or use both formats, and then compare quality and file size.
Make sure you do any editing before you save to a compressed format.

Check on the size of your image:
File size: Right click the image, click Properties. Or minimize your application. Open Explorer. Look at the file size. If the image is under 50 K, fine. If it is bigger, it will load slowly -- start from scratch, maybe.

Image size: that depends on the setting of your display. With 800 x 600, the full size image is a bit larger than 4 x 6", with 1024 x 768, it is smaller.

Here is a scanned slide, not edited:  I opened PaintShop Pro and clicked File, Import, Twain, Acquire (from scanner). This opened the scanner software, and I selected the source, the destination (Web) which set the resolution to 72 dpi, as well as the scale (300 %). Then I clicked Scan.

This produced image1.psp (the extension for PaintShop Pro images) -- file size 6,778,342 bytes.
I clicked File, Save Copy as, landscapecrop.jpg, 1 % compression -- file size 215,765 b:

I opened landscapecrop.jpg, Save Copy as landscape2.jpg, 1 % compression, and cropped this to get rid of the cardboard holder -- file size .64,924 b.
See the picture on the left.

Then, I opened landscape2, Save Copy as landscape.jpg.
I opened landscape.jpg, applied some effects, and saved with about 25 % compression -- final file size 66,502 b.
The image on the right is the final version after the following effects were used:: Resize, Sharpen, Contrast, Brightness, 25 % or so Compression.
The weather improved dramatically.

Never edit the original -- always work on a copy.

The JPEG format compresses an uncompressed image file, as you can see in the file sizes given above. The GIF format also compresses: it is useful for B/W photos,  line drawings or graphs. Photoshop or PaintShopPro files, or Bitmaps or TIFF files exported from a high end camera, on the other hand, are complete no-loss images -- with a much larger file size.
Therefore, if you want to print the image, scan at high resolution and do all your editing in the no-loss format.

But for use on the computer (web page or casual sharing by e-mail), use the compressed format. Please note that each time you save a jpg file, a loss occurs. Therefore, set the compression to the minimum, 1 %, in all intermediate stages of editing.
Compress the final version by 25 % or more.  See http://www.lehman.edu/faculty/hoffmann/itc/techteach/graphics/zebra_jpg_compression_rates.htm

More editing options include flipping or mirroring an image or rotating it if, say, it is crooked, . You can also remove spots and replace or adjust color, as for "red eye."  Or you can use some of the great number of effect options  included with the software, especially when you use Photoshop that has lots of third party options. I prefer PaintShopPro which is cheaper, easier to learn, and has more options than I would ever dream of using.

Pull down every menu from the main menu of your software to see what is available.

One can also "play around" -- I had a lot of fun creating a "composite" by combining a piece of ground cover and a piece of sky for a background on which I placed a mushroom, with several copies in different sizes, and a picture of a friend -- see http://www.nemf.org/files/Signaturecapture/sam_in_wonderland.html

see simple instructions for editing with PhotoShop or PaintShopPro

Ursula :Hoffmann, March 2006