Clean up dirty white background

[Ikikuru]

Hey guys,

 

Anyone aware of an easy way to clean up this dirty white background i.e. can I make it pure white? Using affinity photo.

[Ikikuru]

Ahha! Just realised I got an answer in a completely different post previously! Just use erase white paper in filters! Job  done!

****ok, so this does not work, it still leaves a dirty background!! Any ideas?****

 

[NotMyFault]

I would suggest the following workflow.

1. Create a helper layer to allow a better selection by blurring the noisy background.
2. use flood selection tool to add all background areas to a selection
3. create a mask, manually fine-tune the mask.

 

• assuming only image layer is in file, nothing else
• merge visible (converts to pixel layer and creates a copy)
• execute a bilateral blur, 2-5px radius. This will smooth the noisy background. 
• merge visible
• rename layer to "blurred for selection"
• use magic wand / flood selection tool. lower tolerance to 5-10%. set mode to "add". Activate "continuous"
• click on all white areas once to add them to selection
• when happy, create mask from selection
• invert mask
• add fill layer in contrasting color. put below masked layer
• check for any imperfections. use brush in white or black to add/remove parts