COMPRESS, RESIZE, AND CONVERT IMAGES IN BATCH MODE

(Virtually Essential if you take a lot of pictures

or scan a lot of images)

Select a single image or hundreds of images to compress and resize them all at once with the AIPS powerful batch routine. Selected files can be in jpeg or bitmap format and the files can be saved in jpeg or bitmap format. Batch processing a large number of files provides enormous time savings when preparing your images for the web or for external devices such as digital photo frames.

With AIPS you can change the jpeg image compression factor, and the image's width and height as desired or even convert the image to black and white.

The AIPS Main Batch Form
(The AIPS image batch compression form)

Features of AIPS batch mode include:

Batch process as many images as desired in one easy operation.
Control the exact dimensions of your processed images to enlarge or shrink your pictures.
Total control of jpeg compression quality factor, from 0 (maximum compression with minimum quality) to 100 (minimum compression with maximum quality).
Apply jpeg options including "progressive display", "performance", and gray scale.
Get immediate feedback! AIPS will immediately display the image with the selected options and display the size of the image file.
Confirm each image as it is processed or click "All" to save time.

ABOUT JPEG FILES

Jpeg files are extremely important because they result in relatively small file sizes that result in significant disk space savings. The small file sizes also make them ideal for emailing, especially for users with dial-up connections because small files transfer much more quickly than the original large files.

Jpeg files are known as "lossy" because, through nearly magical mathematical routines, they throw away image data and compress the file. The amount of image data discarded is controlled by a "compression factor". For most images a compression factor of 90 will result in an image that will still appear excellent to the human eye while resulting in a much smaller file size.

The following 5 pictures show the results of compressing a picture with compression factors of 90, 70, 50, 25, and 1 (just for grins). Note how the file size (originally 116,800 bytes) decreases... but so does the picture quality.

jpeg with 90% Compression
This is the original picture with a 90% Compression Factor
File Size = 50,971

jpeg with 70% Compression
This is the picture with a 70% Compression Factor
File Size = 27,914

jpeg with 50% Compression
Here it is with a 50% Compression Factor
File Size = 20,275

jpeg with 25% Compression
A 25% Compression Factor
File Size = 12,625

jpeg with 1% Compression
And finally a Compression Factor of 1
File Size = 2,415

This subject wouldn't be complete without showing the affects of writing the image in gray scale (black and white). If file size and image size are both critical factors, gray scale might meet your needs. Check out the following example:

Jpeg Black and White with 90% Compression
Compression Factor of 90%
File size is 45,187 (over 10% less than with color)

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