In order to convert JPEG, PNG, TIFF, and Raw images to the SID format, you need an Extensis account and a data plan.
SquishPic calls this type of conversion “compressing” because you have the option of compressing the output file.
NOTE: You can also use the Compress Image function on an existing SID file to compress it even further; this operation does require a data plan.
To compress a file:
Open the image in SquishPic.
Log in to your Extensis account if you are not already logged in.
Click Compress Image.
In the Compress Image dialog, specify the compression level and quality of the output image.
Click Compress, then choose a destination and filename and click Save.
The top of the dialog lists the file name and size of the current image.
The bottom of the dialog allows you to set the quality and file size of the output image.
Choose Same as original to have the output image use the same image quality as the original.
Choose Lossless to have the output file keep the same pixels as the original.
Use the Quality and File size sliders to set the desired balance for the output file.
When you move one slider, the other moves in the opposite direction. When you increase the quality of the output image, the file size gets larger; when you decrease the file size, the quality is reduced.
When you move the Quality slider, the compression ratio will be displayed and updated as you move the slider.
When you move the File size slider, the approximate size of the output file will be displayed and updated.
The estimated file size of the output image is shown at the middle of the dialog.
The right side of the dialog lists information about your compression data plan: the amount of data available, the amount of data that will be used by compressing the current image, and the amount of data that will be left after the image is compressed.
When you have specified the output image quality and size, click Compress and select a location and filename for the compressed image.
TIP: You can set the default compression quality and file location in Preferences.