Remove background to scanned document

Here is a receipt which I found for removing the background for a scanned document. In my case are the scanned pages for scores.
As tools I used GIMP and online tool to decompose a PDF file to images and another tool to compose a PDF from images.

• https://www.gimp.org/
• https://pdftoimage.com/
• https://www.ilovepdf.com/jpg_to_pdf

Decompose the PDF file into images

Using the online tool https://pdftoimage.com/, decompose PDF file into images.

Remove background

Open the image in GIMP application

 

Next step is to change the Saturation to 0.00.

1. Choose from top menu Colors > Saturation
2. Set value to 0.00 for Scale

Change few values for Shadow

1. Choose from top menu Colors > Shadows - Highlights
2. Set value to 10.0 for Common > White point adjustment
3. Set value to -50.0 for Highlights > Highlights

As last step the image can be sharpen

1. Open Filters > Enhanced > Sharpen
2. Set value to 2.0 for Amount

That's it. Export the image or overwrite the original one.

Compose PDF from images

Open the website https://www.ilovepdf.com/jpg_to_pdf and create the PDF from images.