How to use Worksheet Eraser, and what to do when marks remain
The basic flow is upload, erase automatically, touch up by hand, and save as PDF. Below that is a list of settings to change when the result isn't quite right.
The basic flow
Upload photos
Press "Upload photos" and pick one or more pictures of the test. On a computer you can also drag them onto the workspace. A sample test is loaded when you first open the page, so you can try every tool before using your own photo.
Fix corners (for angled photos)
"Fix corners" shows four blue dots. Drag each one to a corner of the page and press "Apply" to straighten it. Turn on "Letter-size proportions" for standard US Letter paper.
Erase automatically
Red pen, blue pen and highlighter are removed as soon as the photo loads. Untick a color in the settings if you want to keep it.
Touch up by hand
Choose "Eraser" and rub out what's left. Rub with the "Restore brush" to bring back anything erased by mistake. "Size" changes the brush, and "Undo" goes back one stroke at a time. Choose "View" when you want to scroll the page.
Compare and save
Slide "Compare" to see the original on the left and the result on the right. Check that numbers and answer choices are intact, then press "Save as PDF". Several pages are saved together in one PDF.
When something isn't right
| Problem | Setting to change |
|---|---|
| Faint red or blue marks remain | Raise "Color sensitivity" |
| Printed colored text (titles, shaded tables) gets erased | Lower "Color sensitivity" or untick that color |
| Pink or light blue outlines remain | Set "Edge cleanup" to High |
| Pencil marks remain | Raise "Fade light pencil" a little at a time |
| Thin printed lines or light pictures fade | Lower "Fade light pencil" |
| Paper looks yellow or one side is dark | Turn on "Fix shadows & lighting" |
| You want to save ink | Turn on "Black & white" |
What it can't do yet
- Automatic black pen removal. Black ink looks like the printed text, so for now use the eraser. Automatic detection is in the works.
- Recovering text under heavy marks. If a mark completely covers printed text, the hidden text can't be brought back.
Settings apply page by page. Use "Apply these settings to all pages" to copy one page's settings to the rest.