Is there any tool can change scanned PDF images into grayscale type?
Now, the tutorial below explains how to use A-PDF Scan Optimizer to change scanned PDF images into grayscale type:
- Free download and install A-PDF Scan Optimizer, run pdfso.exe, the first step is to add PDF Documents: Click "Add Folder" or "Add", you can add a folder (Include sub folders) of PDF files together, or even drag files to the list directly;
- Click "Turn On" below "Convert images to monochrome in PDF" and then click "Settings…" to define Black/White mode for changing PDF files into monochrome as follows:
- Click "Optimize" or "Optimize And Save As" to save grayscale PDF documents.
Besides monochrome PDF files, you can also de-skew scanned files:
Click "Turn On" below "De-Skew Scanned Images in PDF", then click "Settings…" to define angle for de-skewing pages:
Then click "Optimize" or "Optimize And Save As" to save de-skewed PDF documents.
Let’s compare the optimized pages with original file:
You can also downsample PDF documents:
Click "Turn On" below "Resample – Reduce the File Size" and then click "Settings…" to define how to resample images in PDF files
By Scale: All images in PDF will be resampled to the specified percentage of full scale of original images;
By Width and Height: Only if the width or height of original images is larger than the defined Max values, the images will be resampled to the specified size.
You can even delete blank pages in scanned documents:
Click "Turn On" below "Delete Blank Page in PDF" and then click "Settings…" to adjust parameters for testing and then delete blank pages:
- Click "Settings" to turn on optimize items in Hot Directory;
- Click "Hot Directory Mode" and turn to the interface of "A-PDF Optimizer Services";
- Add folder for monitoring as follow image:
- Click "Start Services" to operate Optimize Service automatically in background.
Click the download button to free download a trial version.
- A-PDF Deskew - Correct the skew scanned images in PDF files directly
- A-PDF to Black/White - Convert the images to monochrome or grayscale in PDF files directly
- A-PDF Image Downsample - Resample the image in PDF files directly
- A-PDF Scan Optimizer - batch optimize your scanned PDF documents
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