Resample Images

Belongs to

Category: Image

What it does

Recompresses and resamples color, grayscale and single-bit images in the PDF. This is usually done to reduce the size of the PDF file.

Note: If you only want to recompress images, you can use Compress Images.

For more information, refer to the chapters "Compressing pixel images" and "Resampling pixel images" in the PitStop Pro Reference Guide available on the Enfocus website.

How to proceed - sampling images:

For each of the image types, select the appropriate sampling method:
- Keep original sampling
- Average resampling at
- Subsample at
- Bicubic resampling at
- Bilinear resampling at
- Bicubic B-Spline resample at
If you have chosen to resample the image, enter the desired ppi.
To set a threshold, select Resample above and enter the desired ppi.

How to proceed - compressing images:

For each of the image types, select the appropriate compression method:
- Keep original compression
- No compression
- ZIP, JPEG or JPEG2000 (for color and grayscale images)
- ZIP, CCITT Group 3, CCITT Group 4, Runlength (for single-bit images)
If you have chosen JPEG or JPEG2000 in step 1, select the appropriate quality level.
Note:
- The higher the quality level, the more detail in the image will be preserved but the larger the size of your PDF file will be.
- In case of JPEG2000, "lossless compression" is supported.
If you need to transmit your PDF documents through channels where only ASCII characters are allowed, select the appropriate ASCII filter. Note that ASCII HEX may double the image data size, whereas ASCII 85 may increase it by approximately 25%.
Otherwise choose No filter.