One of the more obscure camera questions I occasionally field on my workshops from participants who shoot Canon is ‘what is Canons Aulớn Lighting Optimiser và should I be using it?’ I received this exact question this morning via tin nhắn from a Canon user who just received their new camera và wanted khổng lồ understand how this feature works.

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First, some history on the Auto Lighting Optimiser (ALO). ALO was originally introduced as a feature on the EOS 450D DSLR in 2008. It has since found its way onlớn all current Canon EOS DSLR cameras, from Canon’s most basic entry-màn chơi DSLR lớn the professional EOS-1D X MKII (it was never included in the 1DS MKIII).

ALO is designed to even out contrast by selectively adjusting areas of the image. It is by definition most useful when using flash or with backlit subjects as it can detect faces in the frame and brighten those areas to achieve a better result. In a nutshell, the alặng of ALO is to lớn provide in-camera processing that will improve the look of your images. Those of you paying attention will have sầu already figured out that it applies to lớn jpeg files because it is working on in camera processing.

ALO analyses contrast in captured images và modifies both shadows và highlights via tone curve sầu adjustments khổng lồ minimise loss of detail in high contrast light conditions. There are three levels of setting strength in the current EOS 1DX MKII (low, medium and high) as well as the ability lớn turn the setting off. The levels can be used at any ISO tốc độ setting.

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The first thing you should know about ALO is where it is located in your cameras thực đơn. ALO is found in the jpeg unique menu. This tells us that this setting applies lớn jpegs (not RAW files). If you shoot RAW then you can pretty much ignore ALO; with the caveat that it can be applied in post-production if you implement Canon’s Digital Phokhổng lồ Professional Software. If you are using Canon’s Digital Pholớn Professional workflow software (I honestly don’t know anyone who does), ALO can be applied khổng lồ RAW images taken on compatible cameras during the post-processing workflow. This cannot be accomplished in Adobe Lightroom. Is this worth doing? Personally, I don’t think the benefit is worth the extra step (I would rather use a filter lớn tame the scene contrast in camera), but your mileage might vary.

When you select a Quality setting that results in a JPEG image tệp tin (have sầu I mentioned you really should be shooting RAW?), ALO tries lớn enhance your pholớn while it’s processing the picture in camera. Unlike Highlight Tone Priority, which concentrates on preserving highlight detail only, Auto lớn Lighting Optimizer adjusts both shadows và highlights lớn try và improve the final image tonality. This ‘could’ be useful if you are shooting jpegs in high contrast lighting & have no intention of doing post production work at a later date.

To sum up: If you shoot RAW (as I do) then you can ignore the ALO setting và just leave sầu it off. If you insist on shooting jpeg then you should experiment with ALO lớn see what benefit it can yield to your jpeg files in certain high contrast lighting situations.