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Lens Blur in the new Google Camera app

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221–230 of 249 posts

Re: Lens Blur in the new Google Camera app

#221
post #10

Is looking at the examples giving anyone else a headache? It's like the software blur falls into some kind of uncanny valley for reality.

Any form of blurriness can have this effect - I presume your eyes are interpreting the blurriness as something not being in focus, and are repeatedly trying to focus, causing strain. (I first observed this effect when watching someone playing World of Warcraft, when their character got drunk it made the whole screen blurry and gave me a headache)

Re: Lens Blur in the new Google Camera app

#222
post #5

Regarding the technology (achieving shallow depth of field through an algorithm), not Google's specific implementation ... Up until now, a decently shallow depth of field was pretty much only achievable in DSLR cameras (and compacts with sufficiently large sensor sizes, which typically cost as much as a DSLR). You can simulate it in Photoshop, but generally it takes a lot of work and the results aren't great. The "sh…

One limitation of this that nobody has mentioned yet is that if you have to pan your cameraphone as you are taking the photos to generate the depth map you will have a harder time composing your photo than you would with a traditional photo. Usually I like to spend a few seconds getting into the best position and framing my photo carefully before taking it. Getting the photo I wanted would therefore be much harder if I had to pan the camera around as I was taking it. I don't have Android so can't test it out... anyone using the app got any views on this?

Re: Lens Blur in the new Google Camera app

#224
post #222
post #5

Regarding the technology (achieving shallow depth of field through an algorithm), not Google's specific implementation ... Up until now, a decently shallow depth of field was pretty much only achievable in DSLR cameras (and compacts with sufficiently large sensor sizes, which typically cost as much as a DSLR). You can simulate it in Photoshop, but generally it takes a lot of work and the results aren't great. The "sh…

One limitation of this that nobody has mentioned yet is that if you have to pan your cameraphone as you are taking the photos to generate the depth map you will have a harder time composing your photo than you would with a traditional photo. Usually I like to spend a few seconds getting into the best position and framing my photo carefully before taking it. Getting the photo I wanted would therefore be much harder if…

You first take the picture normally. After taking the picture it asks you to slowly move the camera up to generate the depth of field, so there's no moving the camera as you're taking it

Re: Lens Blur in the new Google Camera app

#225
post #222

Earlier quoted context omitted.

One limitation of this that nobody has mentioned yet is that if you have to pan your cameraphone as you are taking the photos to generate the depth map you will have a harder time composing your photo than you would with a traditional photo. Usually I like to spend a few seconds getting into the best position and framing my photo carefully before taking it. Getting the photo I wanted would therefore be much harder if…

You first take the picture normally. After taking the picture it asks you to slowly move the camera up to generate the depth of field, so there's no moving the camera as you're taking it

Ah cool, so not a problem. Out of interest how long does the camera-moving step take?

Re: Lens Blur in the new Google Camera app

#226
post #225

Earlier quoted context omitted.

You first take the picture normally. After taking the picture it asks you to slowly move the camera up to generate the depth of field, so there's no moving the camera as you're taking it

Ah cool, so not a problem. Out of interest how long does the camera-moving step take?

> Out of interest how long does the camera-moving step take?

Around 1 second. You only have to move the phone a tiny bit (maybe 3cm)

Re: Lens Blur in the new Google Camera app

#227
post #225

Earlier quoted context omitted.

You first take the picture normally. After taking the picture it asks you to slowly move the camera up to generate the depth of field, so there's no moving the camera as you're taking it

Ah cool, so not a problem. Out of interest how long does the camera-moving step take?

I would say that it takes about 1 second on my nexus 4. If you do it too fast the app will complain, but I find that it's actually very fast and easy to do right.

Re: Lens Blur in the new Google Camera app

#228
post #225

Earlier quoted context omitted.

You first take the picture normally. After taking the picture it asks you to slowly move the camera up to generate the depth of field, so there's no moving the camera as you're taking it

Ah cool, so not a problem. Out of interest how long does the camera-moving step take?

It still seems like a problem to me, if your subject (and potentially background) are moving around a lot. I shoot a lot of macro shots of bugs that are always about to jump off plants that are swaying in the wind... Not to say this tech isn't impressive and useful, but it doesn't solve DoF problems for tiny cameras in every situation.

Re: Lens Blur in the new Google Camera app

#229

Earlier quoted context omitted.

Hey, is there any chance we can download the RAW data alongside the JPG file?

You can extract the computed depthmap, all-in-focus image, and focus settings from the XMP data of the jpeg. See https://developers.google.com/depthmap-metadata/ for the depthmap format.

That is awesome! But I think he meant the RAW image that hasn't still been debayered or saved in a lossy 8bit format (jpg)

It made the news last year but I guess hasn't still landed? For post processing, the RAW is so much more useful than a jpg

http://connect.dpreview.com/post/2707133307/google-android-a...

Re: Lens Blur in the new Google Camera app

#230

Wow.. this is missing the entire point on why lens blur occurs. Lens blur in normal photographs is the price you pay because you want to focus sharply on a subject. The reason photos with blur looks "cool" is not because the blur itself but its because the subject is so sharply focused that its details are order of magnitude better. If you take a random photo, calculate depth map somehow, blur our everything but the…

> Subtracting details from background without adding details to subject ... Not sure what you mean by this. Blur is only due to focus distances and aperture sizes. Making the depth of field narrower (making the OOF regions more blurry) does not add detail to the areas that are in focus. Usually, it's even the other way around. Example: Say we shoot a portrait of a person at 5m with a forest 30m away in the background…

But there are still advantages. With a larger aperture the sensor/film is receiving more light which means the shutter speed can be increased. If the subject isn't perfectly still this can result in decreased blurriness. It's been a while since my HS photography class but I think that's correct.
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