Lens CorrectionThe Lens Correction filter consists of a very user-friendly dialog box which allows a range of related lens corrections to be performed simultaneously.
- Barrel and Pincushion Distortion
- Chromatic Aberration
- Horizontal and Vertical Perspective
- Angle and Straightening Horizons
Barrel and pincushion distortion is usually only noticeable in images shot at extreme wide angle or telephoto and specifically with straight lines close to the edges or in images with an off-center horizon.
One great feature of the Lens Correction filter is that you can drag your pointer over the preview and see the effect of your correction in real time. I found that this, combined with the grid overlay, resulted in quick adjustments that reduce the barrel or pincushion distortion to a visually acceptable level.
Because Photoshop CS2 uses only one correction parameter, compared to three in Panorama Tools, it is less accurate. PTLens, a freeware Photoshop plug-in based on Panorama Tools written by Thomas Niemann, takes away the guessing of the Panorama Tools parameters and currently covers a wide range of lenses and cameras, including many digital compacts with converters.
The thumbnails below link to the full size images. The red squares in the thumbnails indicate where the crops below were taken. The 80 x 80 pixel crops are 2 times (pixel) enlarged via nearest neighbor interpolation. I drew a straight red reference line in the original, the Photoshop CS2, and PTLens results so that it "touched" the straight line of the building in the middle in all three cases (as shown in the second row of crops).
I'd say that if you want a quick and easy correction that combines other corrections such as straightening horizons, adjusting perspective, vignetting and chromatic aberrations, the Photoshop CS2 Lens Correction filter will lead to visually acceptable results in most cases. However, if you are a perfectionist or are working on a mission critical image, the free PTLens plug-in will provide a higher level of accuracy.
The chromatic aberration correction provides a reduction that varies more with the image than is the case with Adobe Camera Raw (discussed on the next page), which in many instances eliminates all chromatic aberration. In the first example, the chromatic aberration correction performed nearly as good as in Adobe Camera Raw (if you look at the enlargement, there are some color artifacts around the edges in the lens correction crop). In the second example, the chromatic aberration correction performed less well than Adobe Camera Raw as quite a bit of chromatic aberration remains.
Unlike chromatic aberration correction, the vignette correction performed equally well as in Camera Raw. And unlike the barrel and pincushion distortion, it performed better than PTLens as well. Note that in order to achieve visibly similar results, the vignetting slider adjustments in the Camera Raw window will be different than those in the Lens Correction dialog box.
Notice the vignetting in the right corner
After Photoshop CS2 Lens Correction
Vignetting is completely removed
Some vignetting remains
(more visible on full size image)
The perspective and the angle adjustments are the same as those in the Image -> Transform command. There is also an angle tool to automatically straighten horizons (similar to what you can achieve with the Measure tool). So although this is nothing new, it is very useful to have those adjustments available in one dialog box while doing other lens corrections.
This article is written by Vincent Bockaert, author of
The 123 of digital imaging Interactive learning Suite featuring
Adobe Photoshop Elements 2 & 3 and Photoshop 7, CS & CS2
Click here to visit 123di.com
Jun 23, 2005
Jun 23, 2008
Jun 23, 2008
Jun 23, 2008
|Christine by JP Zanotti|
from Car wreck
|Fangorn Forest by cand1d|
|Yosemite Falls with Moonbow by Jonathan Shapiro|
from Best Landscape of the Week 4
Sony is the world's leading mirrorless camera brand but remains third for ILCs overall, it's said in a presentation to investors. A focus on high value cameras and lenses should boost operating income, it says. Read more
It's nicknamed the 'Cycloptic Mustard Monster,' and is a 3D printed medium format camera. Read more
The new NanGuang LED lights are battery powered and come with accessories including filters and diffusers.
Have you been telling yourself, "Hey, I really need one of those 8K displays?" A video about Dell's new 8K monitor shows you what to expect. Is it really that much better?
Tamara Lackey, a Nikon ambassador USA and pro shooter, discusses embracing self-consciousness as a means of connecting with subjects.
There's a new Spiderman movie coming out and the poster been generating a lot of online chatter. Mostly about how it looks like the creation of a fevered teenager that just discovered Photoshop.
An honest defense of the system's merits, with photos as proof.
Copyright disputes are no fun at all. 'Binded' is a new startup that aims to simplify the process of registering - and enforcing - copyright for photographers. Read more
Not everyone wants to pay a premium for a long zoom camera. Thankfully, there are many reasonably priced cameras available, though they won't offer the same image quality as enthusiast models. In this updated roundup we look at big zoom cameras with more consumer-friendly price tags. Read more
Think Tank Photo has updated two of its popular bag lines with improvements to functionality. Read more
We’ve all seen Bob Jackson’s Pulitzer Prize winning photo, but there's another.
The sample footage looks good.
It will automatically pick the best camera settings depending on shooting conditions. It even promises enhanced functionality for your camera, like exposure and focus stacking. It already supports many cameras from Canon, Fuji, Nikon and Sony. Read more
As if $13,950 wasn’t enough to pay for a special edition lens, the Leica Store in San Francisco is offering a prototype of said lens for $24,995. Read more
Make those old photos disappear without deleting them forever.
Firmware updates enable 10 fps shooting with adapted A-mount lenses, and faster startup times and better compatibility for 20 fps shooting when using native lenses on the a9.
Fujifilm has released firmware updates for its camera models X-T2, X-Pro2, GFX 50s, X-T20, X100F and X-T1 and updates to three of its software products.
A 22 year-old Romanian photographer uses his DJI Phantom 4 drone to capture unique perspectives of the city where he now lives.
What's it like to ride the waves with champion surfer Kelly Slater? This VR video from Teton Gravity Research gives you a taste.
When Nikon released the full-frame D3 in 2007, it changed the professional photography industry. In this week's Throwback Thursday, Barney remembers a legend. Read more
The new stuff should have better red hues, improved sensitivity and finer grain - but don't worry - will still shift blues to green, greens to purple and yellows to pink.
Ricoh has introduced a new rugged compact camera with a 16MP CMOS sensor, 28-140mm lens, 2.7" LCD and built-in LED macro lights. Read more
This compact drone can shoot HD video using a 2-axis stabilized 12MP camera. Read more
The new Prynt Pocket can print a photo directly from their iPhone simply by inserting the phone into the printer, then snapping a photo. Each print will cost about 50 cents. Read more
Updates for Adobe Camera Raw and Lightroom CC bring support for the Sony A9 and Panasonic ZS70/TZ90, along with bug fixes.
The Triggertrap remote camera control system is no longer sold due to the company folding, but now users will be able to build their own. Read more
The Magic Format Converter comes with internal optics that expand the image circle of full-frame DSLR lenses for use on the Fuji medium format camera. Read more
The usually Apple-exclusive MacPhun software developer has announced that it will introduce PC versions of two of its most popular applications. Both Aurora HDR and Luminar should be available for the Windows operating system by the autumn of this year. Read more
Sony's newest G Master telephoto zoom, announced alongside the a9, is the first of the company's FE lenses to reach 400mm natively. We had one in California and photographed horses, portraits, and landscapes - check out how it did. Read more
Garmin has entered the 360-camera market with the VIRB, which captures 5.7K video at 30p as well as 15MP stills. Read more