It is called Compress.
File compression
http://www.xfutureblog.com/2007/09/27/how-to-reduce-or-compress-avi-file-size-and-upload-to-youtube/
Decreasing the size of a picture file by reducing its resolution is called "image compression." This process can be either lossless, where no data is lost, or lossy, where some data is discarded to achieve a smaller file size. Lowering the resolution typically results in a smaller file size but can also reduce the image quality.
File Compression
Some ways to reduce the size of AVI files is: 1. Reduce the resolution. 2. Reduce the frame rate. 3. Increase the key frame rate. 4. Change the compressor. However You may lose some quality when trying to reduce file size.
In Windows 2007, reducing the size of a file is typically referred to as "compressing" the file. This can be done using built-in tools like the "Send to" option, which allows you to create a compressed (zipped) folder. Compression reduces the file size by encoding the data more efficiently, making it easier to store or share.
It all depends on the type of digital file you are using. Most printers will do the reduction or enlargement in house. If the printer requires the file to be the exact size of the finished piece reducing the actual physical size of the file is quite simple, with the proper software. Another advantage is that no image quality will be lost when the file is reduced in size, whether it is a jpg, eps or tiff. From within Photoshop choose Image Size from the menu and reduce the size there. You can also scale the image in Photoshop or Illustrator. To reduce the file size you will need to 'stuff' or 'zip' the file with compression software.
Zip the file with a program like WinZip.com
To reduce the file size of an image without compromising quality, you can try the following methods: Use image compression tools or software to optimize the file size without losing too much quality. Resize the image dimensions to make it smaller. Choose the right file format (such as JPEG or PNG) that balances quality and file size. Remove any unnecessary metadata or information from the image file. Experiment with different compression settings to find the best balance between file size and quality.
To reduce file size without compromising quality, you can try compressing the file using a file compression tool or software. This process reduces the amount of data in the file without significantly affecting its quality. Additionally, you can consider converting the file to a more efficient file format that supports compression, such as JPEG for images or MP3 for audio files.
Compress
To reduce a picture size to 10 MB on a Mac, you can use the Preview app. Open the image in Preview, then go to "File" and select "Export." In the export dialog, adjust the "Quality" slider to reduce the file size, and check the estimated size. Alternatively, you can resize the image dimensions by selecting "Adjust Size" from the "Tools" menu before exporting.