Hints and Tips

A mixed bag of hints and tips relating to photography, some on editing others on shooting images and also apps for calculating. real treasure trove.

Getting Rid of Those Halos

Often during the post processing of RAW files we experience the problem of edge artifacts or 'halos' as they are commonly known, becoming particularly apparent in the JPEG conversion. Halos may be caused by a number of factors including sharpening, colour, light and contrast adjustments, downsizing for the web and so on. Halos are typically around 1-2 pixels wide and are more discernible on bright monitors which can accentuate contrasting tones or even our club projected images

So whether you think they're important or not, many of our judges think so and home in on 'halos'. As a result I've spent many hours carefully cloning or brushing those pesky pixels into oblivion. However I have good news! Thanks to our own Photoshop guru, David Price (whom I have paraphrased below) there is a quick and simple way of curing the problem:-

Step 1. Complete your processing workflow, save and resize the image to final.

Step 2. Create a layer in Photoshop and change the layer designation from 'normal' to 'darken' in the drop box in the layer window

Step 3. Select the clone stamp tool and set it to around 15 px and 0% hardness.

Step 4. Enlarge the image to 300-400%

Step 5. Position the clone stamp on the background adjacent to the halo, hold down the alt button and click the left mouse button, release then re position the clone stamp over the halo.

Step 6. Left click the mouse button and holding it down drag the clone stamp over the halo and watch it disappear

Step 7. Continue this technique until the halo has been removed or reduced to an acceptable level

Da-Daaaaaa! No halo!

Note: You may need to adjust the opacity down from 100% to fine tune the output.

DoF Calculator, Why we haven't had this facility before now, I ask...

Just for a bit of fun, try clicking on this link Camera Sim but note; it will only work on a laptop. To see it on a mobile device go to www.camera.com.

Following on from our Flash Workshop, try another link. This is more complex, but really good! Virtual Lighting Studio ...and this one works on my Android.