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Dust-spot Photoshop Question  
User currently offlineJawed From United States of America, joined Sep 2006, 482 posts, RR: 0
Posted (6 years 11 months 2 weeks 2 days 21 hours ago) and read 3600 times:

I found this blob in the same spot on all of my images today:

http://i215.photobucket.com/albums/cc178/javvypics/dust.jpg

I think it is safe to assume that is a dust spot.

Could you explain the best step-by-step instructions for removing such a dust spot in Photoshop? Should I use the clone-tool to copy a nearby sky patch over it? Or is there a better way?

[Edited 2008-01-07 20:38:44]

9 replies: All unread, jump to last
 
User currently offlineJakTrax From United Kingdom, joined Jun 2005, 4936 posts, RR: 7
Reply 1, posted (6 years 11 months 2 weeks 2 days 20 hours ago) and read 3580 times:

Clone tool or spot healing brush. It's a classic perfectly spherical dust-spot so simply adjust the size of the clone stamp/spot healer until it's just a bit bigger than the blemish, then apply with a single click. If it looks OK, great, but you may (may) have to re-adjust the size of the brush (i.e. make it much smaller) and smooth the edges.

One thing I've wondered - is correcting dust-spots in this manner acceptable? Surely this is classed as photo manipulation and therefore a bit of an A.net taboo?

Karl


User currently offlineJawed From United States of America, joined Sep 2006, 482 posts, RR: 0
Reply 2, posted (6 years 11 months 2 weeks 2 days 20 hours ago) and read 3578 times:

Thanks that worked. I believe I have heard others here recommend removing dust spots before submitting to A.net.

User currently offlineWakeTurbulence From United States of America, joined Apr 2004, 1296 posts, RR: 16
Reply 3, posted (6 years 11 months 2 weeks 2 days 18 hours ago) and read 3572 times:



Quoting JakTrax (Reply 1):
One thing I've wondered - is correcting dust-spots in this manner acceptable? Surely this is classed as photo manipulation and therefore a bit of an A.net taboo?

Nothing about removing dust spots is taboo, even on Anet.

Quoting Jawed (Reply 2):
I believe I have heard others here recommend removing dust spots before submitting to A.net.

If you don't your photo will be rejected for "dirty." Dust spots get through screening but not often.
-Matt



Jetwash Images - Feel the Heat!!!
User currently offlineStealthZ From Australia, joined Feb 2005, 5743 posts, RR: 44
Reply 4, posted (6 years 11 months 2 weeks 2 days 17 hours ago) and read 3562 times:
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Karls advice is valid but basic,
I would put money on your original image having more than one dust spot*

The most effective way (apart from keeping your sensor clean) is to make a duplicate layer -
-LAYER/DUPLICATE LAYER (you can rename this layer when prompted but no real need)
Equalise this layer-
-IMAGE/ADJUSTMENTS/EQUALISE, you should now have a bizarre "Pop Art" looking image but the dust spots will be clearly visible-
Switch the active layer back to the background-
- In the Layers dialog box click on the "Background" layer, this should then turn blue.
The image on the screen will still be the equalised "Background Copy" layer but any editing will affect the "Background" layer.
-Select an appropriate sized and shaped clone tool(or healing brush) and go around stamping out the dust spots.
-When you think you are done you can hide the "Background Copy" layer by clicking on the "Eye" symbol to the left of the layer name.
-Equalise the "Background"layer and see if you got all the spots, if you are satisfied Undo Equalise and delete the Background copy layer.
If not satisfied Undo Equalise, Unhide the "Background Copy" layer and repeat the cloning process until happy.


Cheers

Chris

* that is a safe bet because I equalised it and had a look, there is one just above the nose and likely more on your original!



If your camera sends text messages, that could explain why your photos are rubbish!
User currently offlineDendrobatid From United Kingdom, joined Nov 2004, 1689 posts, RR: 62
Reply 5, posted (6 years 11 months 2 weeks 2 days 17 hours ago) and read 3560 times:
AIRLINERS.NET CREW
HEAD SCREENER

Chris's method is the best way to do it and, whilst it sounds log-winded, it only takes a few seconds to do. I do however do things slightly differently.
Before equalising I use the magic wand to select the sky and then simply equalise that. It is impossible to miss dust spots that way. Once they have been dealt with, right click, select the inverse and sharpen. That way you are simply sharpening the subject not the noise or grain in the sky. It can make a big difference if the sky is slightly noisy to not sharpen it !

Mick Bajcar


User currently offlineJakTrax From United Kingdom, joined Jun 2005, 4936 posts, RR: 7
Reply 6, posted (6 years 11 months 2 weeks 2 days 17 hours ago) and read 3556 times:



Quoting Dendrobatid (Reply 5):
Before equalising I use the magic wand to select the sky and then simply equalise that. It is impossible to miss dust spots that way. Once they have been dealt with, right click, select the inverse and sharpen. That way you are simply sharpening the subject not the noise or grain in the sky. It can make a big difference if the sky is slightly noisy to not sharpen it !

Wow! You learn something new every day! So simple but I would never have thought about doing that. Cheers Mick.

Karl


User currently offlineDvincent From United States of America, joined Jan 2007, 1753 posts, RR: 11
Reply 7, posted (6 years 11 months 2 weeks 2 days 12 hours ago) and read 3522 times:
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I use the same method as Chris as it's very effective and has been around for a very long time in the scanning circles. I learned it years ago from a drum scanner operator.

My suggestion for the tool of choice (which has been mentioned in here) is the healing brush. The reason the healing brush is (In my opinion) more suitable to dust removal is that it only modifies the luminance of the cloned area. Dustspots are a luminance issue when you get down to it (hence why equalize makes them show up) and the healing brush is the perfect tool to take them out. This means you don't have to worry as much about the clone source, as you won't get any "clone circles" of obviously cloned areas.



From the Mind of Minolta
User currently offlineJawed From United States of America, joined Sep 2006, 482 posts, RR: 0
Reply 8, posted (6 years 11 months 2 weeks 2 days 8 hours ago) and read 3501 times:

thanks these are great tips. using the magic wand to select just the plane for sharpening makes a lot of sense.

what is the main difference between the magic wand and the quick selection tool?


User currently offlineScotland1979 From United States of America, joined Feb 2005, 548 posts, RR: 12
Reply 9, posted (6 years 11 months 2 weeks 2 days 1 hour ago) and read 3466 times:
AIRLINERS.NET CREW
PHOTO SCREENER

Wow! I haven't tried what Mick Bajcar's quote. I should try some day.
Speaking of healing brush, sometimes I used this to remove dust spots. However, I have struggled to remove just one dust spot from one photo again again again - seem not work. So I will try Mick's



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