Sharpening
Paul Malley • 18 April 2022
SHARPENING
A few Blog entries back, I submitted a short piece of work regarding my use of 'Auto-ISO' which, I'm pleased to say, generated some interest and subsequent discussion at the Clubhouse. In a bid to keep alternative thoughts and views going, this time I'm including a section on my preferred method of Sharpening images (lights blue touch-paper and steps back...), - please note I said "my preferred method" as, not only are there a number of ways of sharpening an image, but it is one of the most 'Subjective' issues when concluding a workflow process.
Many DSLR units are fitted with an anti-aliasing filter in the sensor path, which counter affects the moiré patterning, or coloured cross parallax of some light wavelengths. Anything placed in front of the sensor, can optically reduce the efficiency of the light path so, to overcome this, a degree of sharpening of an image is required, to reinstate any corrective action. Newer DSLR and Mirrorless units do not all have this anti-aliasing filter, but sharpening is still applied within the workflow.
Sharpening works by producing a better defined line (NOT the same as contrast) at boundary edges, (in the good old wet darkroom, this was termed Acutance). The degree and method of sharpening as stated, is hugely subjective as, applied to the wrong style of image, or at the wrong focal viewpoint, or in too greater strength can be detrimental. I have seen the evolving of sharpening within 'Photoshop Elements' since about 2008, where it was issued as a simple one-click function under the 'Enhance' Tab as 'auto-sharpen'. This was a quick one-stop pass that applied sharpening via an algorithm which, although hit and miss at times, gave a somewhat credible change. In subsequent versions, it became more refined, and sliders were introduced, offering control into variable levels of overall sharpness. About 10yrs ago, a huge step-change came in whereby the edge radius and strength could be altered to suit, offering 0.1 pixel units. Nowadays, sharpening can be done on separate layers, combined with clarity, contrast and split down within different layers, even identifying selective target areas to sharpen, before they are all merged down like layers in a sandwich.
For me, in my current Affinity Photo Software, I use a 3-stage sharpening process (Please note there are differences at the final stage for presentation in Print format, or display as a PDI). I conduct each stage in isolation, and it is done as the final part of my jpeg workflow process before I save the image.
Stage 1. This is a PRE-SHARPEN action, where the minimal radius and strength factor are applied to the overall image via the strangely termed 'Unsharp Mask' (each part of the image gets the same sharpening factor in one operation).
Stage 2. This is CREATIVE or SELECTIVE Sharpening, where I can select/identify what part of the image I wish to enhance beyond Stage 1. It may be the model's eyes, a tree in a landscape, or a head-on motorcycle fairing. In this stage, using a New Layer, selecting a brush, I work round the item and check it is bounded by the infamous 'marching ants'. Once identified a second pass is given using the same as in Stage 1. Once completed, a simple deselect of the marching ants shows the added 'pop' of the detail within the selected area. I then Merge/Flatten the Layers into one.
Stage 3. The final action is termed OUTPUT Sharpening. For me, working in PDI, I resize the document to the longest 1920 x 1200 format and apply a final overall sharpen in Unsharp Mask at a low output. This third and final stage can be dramatic as it is at the output for a good projected resolution.
If all has worked well, the image should have a nice, overall sharpness courtesy of stages 1 and 3 and the main point which the viewer may concentrate or gravitate to should have that extra pop, courtesy of Stage 2.
As a small aside, I remove my Noise during RAW conversion, as you don't want to be working on a noise image, either by creating Layers and putting Noise on top of Noise, or sharpening Noise at three separate stages. Noise can also have the effect of apparent sharpness reduction, - so get rid of it early.
Be wary of over sharpening, it can lead to artefacts, jagged edges or fringing, in worse cases it can also promote haloing or banding separation. Sometimes, less is more and I usually 'back-off a bit' on my final sharpening, rather than push a sharpening boundary.
Have a try with small amounts of sharpening, on different Layers (always on a working copy file, not the original primary jpeg) and pick something out that you want the viewer to look at. I have done my 3-Stage approach on this image of the Kingfisher, with selective sharpening applied to the head and leading edge of the wing.
Louth Photographic Society
Good Morning All Sand racing starts again this week at Mablethorpe, this Sunday is practice day, times are on their website. Last week at the club we held a local competition, with the categories of: "Straight out of the camera" and "Open", there was a very good entry in each subject with Tony Gaskins having the task of judging the unedited ones and Robin Begley judging the Open. There is a full report on our website but well done to Harry for first place in the Straight out of the camera and Keith Rossington for first place in the Open. This week, Wednesday 14th, Steve West will be our speaker, talking and showing PDI's on the subject of the Louth cinema. The following week will be a print competition, with the categories of "Mono" and "Open", you need to bring your prints in this week and send an email to Dave Turner with your titles. Regards Graham
At our meeting last night we held a PDI (printed digital image) competition, with the categories of "Local Unedited", and "Open". As this was a members competition one of our members judged the competition, Tony Gaskins was our first judge for the "Local Unedited" category, these were .jpg images taken straight from the camera, without any editing, apart from the resizing for projection. Presenting an image such as this in a competition is quite a difficult task, the photographer has to ensure that the correct exposure is chosen, the composition, and subject matter has to be precise, everything done in camera. Normally for competition entries, a degree of post processing would be involved, simple edits like toning down highlights, or even removing extraneous objects from a scene, emphasising a moody sky, all not allowed. Tony Gaskins did an excellent job with his judging, providing clear and concise critique of the images presented, he "held back" 8 images for further consideration, awarding higher points, and finally choosing the top three placements. After the break it was Robin Begley's turn to judge the "Open" category, as these were post process edited images the standard was higher than the unedited images, but surprisingly not markedly so. Robin is potentially hoping to become a N&EMPF approved judge, and he had a different style, able to suggest edits that could have improved an image, again his critique was clear and concise communicating well with members. Robin chose 8 images for further consideration, awarding higher points, and finally selecting the top three placements. It was a fabulous, and interesting competition with excellent images, many thanks to both our judges, it's not an easy job, probably nearly as bad as being a referee in a football match!! Many thanks to both our judges, well done.
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Roger Hance Memorial Lecture 16th October
Last night Lee Dixon from Cleethorpes Camera Club gave his first ever presentation to a camera club, which we were privileged to view. His presentation consisted of portraiture, creative, and his genre of choice; wildlife. Lee is an extremely talented photographer, with a highly creative portfolio, his portraits are quite atmospheric, unusual, and capture the essence of the model, and scene. For Lee’s creative work, he buys props from charity shops, often very cheaply, reusing those props in various scenes. For his composite work he will often take one of his photos of a room, and blend it with a subject in Photoshop using “blend” modes. For wildlife he visited Lake Kerkini in Greece to photograph the Pelicans, if the sky is a little on the bland side, Lee will often over expose the image resulting in a striking white background to the subject. On safari in Africa Lee showed us some amazing images of the wildlife, the close-up images of elephants, the wildebeest migration, and this stunning image of a cheetah. Lee was ably assisted by Mike Bennett. More of Lee’s work can be found on his website: https://leedixonphoto.co.uk/ Lee his kindly given permission for his images to be used in this post. Many thanks to Lee, and Mike for an amazing evening.
Good Morning All Last week at the club we held our monthly PDI competition, with the categories of "Objects in the Air" and "Open", there was a very high-quality entry in both competitions and judge Mike Bennett had quite a job on his hands scoring the entries. Well, done to Dave Turner for first place in the Objects in the Air and Tony Gaskins for first place in the Open. All the results are on our website. This week, Wednesday 30th September, our speaker will be Lee Dixon from Cleethorpes Camera Club showing us his natural history, Creative and many other photographs he has taken. It will be the first time Lee has shown his photographs at our club. If anyone else wants to enter PDI's in the 2027 N&EMPF Exhibition, the deadline is this Wednesday at midnight. Harry is still taking entries for the PDI competition, with the categories of "Local Straight from Camera" (unedited .jpg), and "Open", to be held on Wednesday 7th October. Regards Graham
At the meeting last night Mike Bennett judged our competition with the categories of “Objects in the Air”, and “Open”. The standard of entries was excellent, and it gave Mike a tough task of judging the images, Mike gave some very good critique of the images displayed, the feedback helps members to develop compositional skills. Dave Turner was awarded first place for his image of the “Tiger Club Display Team” in the “Objects in the Air” category. Tony Gaskins was awarded first place for his image of the “Spectacular Rustgill” in the “Open” category.
Good Morning All, Last week at the club we watched the N&EMPF PDI Exhibition for 2026, it was a very good evening viewing very high standard images from all over the East Midlands. Dave Turner and I did manage to get images accepted; there is a full report on our website. This week, Wednesday 23rd September, we will hold our monthly PDI competition, with the categories of "Objects in the Air" and "Open", please send entries to Harry by midnight tonight. Harry is also accepting images for the PDI competition, with the categories of "Local Straight out of the Camera (only resizing permitted)" and "Open". Regards Graham
Members were shown the 2026 N&EMPF PDI Exhibition video last night with all of the accepted PDI images in the first part, and after the break the awarded PDI images. There were some stunning images on view, and Louth was successful in having 3 PDI images accepted, Graham Harrison with his image of a Stonechat, and Dave Turner with his portrait of Paul Rudd, and his monochrome image of Kings Cross railway station "Going Down". Overall it was a good inspirational evening.
Good Morning All Last week at the club members had 15 minutes to show what they had done over the summer. It was a very interesting evening with eight members taking part. There were many locations on show and as usual some excellent photography. There is a full report on our blog. This week, Wednesday 16th September, we will be showing the N&EMPF exhibition, this is part one showing all the PDI's that were accepted. This is the highest standard of photography we as individuals take part in as a club. Members sent around 50 entries but only 3 were accepted. If you are inspired to enter the 2027 Exhibition after seeing the show, I send the clubs entries and I can give you more information. Closing date is the end of September. The Maximum size for N&EMPF is 1600 x 1200 3MB sRGB Harry is still taking entries for the monthly PDI competition, with the categories of "Objects in the Air" and "Open". Harry did ask about what can be accepted, and we couldn't really say as long as it's an object in the Air. The best way is to look up the definition of an object first. Harry is also accepting entries for the Local and Open competition in October. Robin is going to judge the Open competition, does anyone fancy judging the "Straight from the camera" category? Regards Graham
