Output Preferences
Click the "Settings" button of the main window, you will see the Preferences window as the following:
 
 
The following are some useful technical terms you may need to refer when you set PDF parameters.

Passward: Encrypted PDF file, you will need a password.

Page Range: Choose to convert each page, first page, last page, even page, odd page, or a custom page range.
Example "1,3,5-7,9-" Extract page 1, page 3, page 5 through 7, page 9 through end.

X-DPI, Y-DPI: Change DPI settings depending on your needs

Image Size: Customize the width or height of the output image files.

Image Rotate: You can rotate an image in 90, 180, 270,clockwise direction.

Image Type: Supported image formats TIFF, JPG, GIF, PNG, BMP, WMF, EMF, PCX, ICO, TGA, WBMP, JP2,JPC, PGX,PNM, RAS, JBG, MNG, SKA, DCX, etc

Colors: 1, 4, 8, 8-bit grayscale or 24-bit.

Tiff Compression: Support exported multiple compresssed methed tiff (LZW,Packbits,CCITT FAX3 and CCITT FAX4, etc).

Jpeg quality: Jpeg Compression quality,default 75.

Multiple pages tiff file: Convert multipage PDF file to multipage TIFF file.

Rename: For renaming, you can generate a name pattern for new names and the starting index for numbers.
Example: Pattern image_### with start index 1 will produce file names "image_001", "image_002", etc.

Starting counter: Specifies the first letter or number of the sequence.