jenjan Posted March 9, 2016 Share Posted March 9, 2016 Could anyone help me with advice on the best/easiest way to eliminate backscatter from my underwater images and also I would be grateful for some advice on how to alter exposure/brightness on just a small section of the image. For example a white fish belly that reflects back far too much light from my strobe compared to the rest of the image. Many thanks for any suggestions. Quote Link to comment Share on other sites More sharing options...
Staff MEB Posted March 9, 2016 Staff Share Posted March 9, 2016 Hi jenjan, Welcome to Affinity Forums :) I'm checking what's backscatter, never heard the term before so i can't help much with this one, sorry. Regarding the exposure/brightness question, you can add an Exposure or a Brightness and Contrast Adjustment from the adjustments icon on the bottom of the layers panel, set the sliders as you want (at this point the adjustment affects the whole picture), then select just the Adjustment layer and press ⌘ (cmd) + I to invert the adjustment built-in mask. Now select the Brush Tool, set the colour to white and paint over the image (with the Adjustment layer still selected in the layers panel). This will "paint" the adjustment back into the image. You can adjust the Brush settings for more control in the context toolbar (right above the work area). jenjan 1 Quote A Guide to Learning Affinity Software | Affinity Quick Reference | Call for Camera Images Link to comment Share on other sites More sharing options...
R C-R Posted March 9, 2016 Share Posted March 9, 2016 By backscatter I assume you mean light reflected toward the camera from particulates & other impurities in the water & the water itself. If so, the Haze filter in the Filters menu may help. jenjan 1 Quote All 3 1.10.8, & all 3 V23.0 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7 Affinity Photo 1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7 Link to comment Share on other sites More sharing options...
jenjan Posted March 10, 2016 Author Share Posted March 10, 2016 Thank your the welcome and the advice. Yes, backscatter is an underwater photographer's nightmare. It is indeed the small particles in the water (i.e. plankton, etc.) between you and the object that reflect the light from your strobes back to the camera lens. There are various tricks to avoid it with strobe placement, but I regularly need to do some editing when the pesky stuff creeps into my shots. Sometimes there is more backscatter than others and it would be great to know some of the best approaches in Affinity. I shall try the solutions suggested. Thanks once again. Quote Link to comment Share on other sites More sharing options...
Erlang Posted July 8, 2020 Share Posted July 8, 2020 Like some other things in photography, it's easier to fix in the shoot rather than post processing. Angle strobes, that don't light the water column between the subject and the lens. Therefore lighting the subject from anywhere except in front. The only post solution is despeckling possibly by hand. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.