Equipment

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Custom White Balance

Wednesday, April 22nd, 2009

I don’t actually use this much these days, but it’s a handy option to have, especially in difficult to gauge situations.  Setting white balance is easy; it’s as easy as taking a snapshot.  Using it appropriately is tougher.

the custom options for white balance

the custom options for white balance

Setting white balance: go into the menu, like we did yesterday.  This time, go to the far-right option (looks like a couple of triangles and a dot).  Immediately, you’ll start seeing funny things going on, like in the pic to the right.  That’s the custom white balance screen evaluating the balance based on… a black piece of paper. To set this as the white balance point, do what it says: press the MENU button.

So yeah, it’s easy to set white balance.  but what should you use?  Well, something white.  Or non-tinted, at least – grey technically works pretty well, so long as it’s a dead gray.  Snow works, so long as it isn’t yellow (and for us in Anchorage, so long as it isn’t break-up).  Walls sometimes work – I’ve found decent results using grey construction blocks and the interior walls of my house (we painted it an almost flat white).  Shoot, after a long winter in Alaska, I’m so pasty I can even use the back of my hand and get decent results.

These are all techniques that work in a pinch, but it’s better to use a real white balance card or something similar to get it right.  When travelling, I usually carry a card with me.  Running around town? Not at all.  That’s why I rely on presets with the sd500.
What about my SLR?  I usually use kelvin. That’s not an option on the sd500.

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Keeping your Whites Tight

Tuesday, April 21st, 2009

White balance.  It’s more important than most people think – controlls the overall feel of the photo, most notably in regards to how warm or cold it feels.  These days (and even with this old camera), the auto white-balance settings are not that bad.  But by setting it manually, it can be much better.

White Balance Menu Options

White Balance Menu Options

So reviewing the options: most cameras come with presets for straight daylight, cloudy conditions, interior light, fluorescents, sometimes a halogen fluorescent, and (most of the time, unless you’re unlucky) ad custom setting.  Look to the image at right – those are the exact settings in order from left to right.  On this camera, to get there: presS the FUNC button, then move down to the second option (where the icon of the sun is on the left, arrow to the right of it).  From here, you move left or right to select the appropriate white balance.

So, situations: in direct sunlight, definately leave it on the icon of the sun.  This will work pretty well.  Cloudy conditions, you’re thinking: go ahead & shove it over to clouds, right?  Not so fast: that works well for landscape photos, nature photos, maybe flowers & buildings.  But most of the time we’re taking pics of people.  On an overcast day, I usually leave it on sunny when the subject is other people.  This warms up flesh tones & makes the people look a bit more… orange, actually.  But it’s that healthy orange glow that people like in their photographs.

Once you move indoors, you’d think you would want the icon that looks like a bulb, right?  Move to indoor lighting.  Again, sometimes true, but not always.  That bulb is actually balanced for tungsten lighting, or typical indoor lights.  But these days, you can get indoor lights that are daylight balanced – if you use the indoor setting for daylight balance, your photos will have a blue tint to them.  Not good.

So, the general rule that I follow: if I can detect a slight yellowness to the light, I shift into this white balance.  If not?  Leave it at cloudy.  Yes, cloudy.  Cloudy is slightly warmer than most daylight-balanced bulbs so flesh tones come out well, yet it’s close enough that everything else will look natural.

The next setting, fluorescent lighting.  If you see flourescent lights, use this.  Flourescents give a slightly off-cast to color (usually slightly green), and you don’t really want people in your pics with a slightly green tint.  Unless it’s your kids after gorging on candy.  Then it’s normal.

Halogen flourescent?  I don’t use this, actually.  Ever.  Perhaps someday I’ll rethink that.

Custom white balance is a pretty large topic.  That will be covered in tomorrow’s post.

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Caring about ISO

Monday, April 20th, 2009
ISO options on the sd500

ISO options on the sd500

I don’t really want to get into ISO.  At least, I don’t really want to get too far in to the technical details.  Effects, yes.  Science, no.  Want some details?  Check out wikipedia.  Or, as I originally learned it: read The Negative by Ansel Adams (be warned, it’s not for everyone & certainly not appropriate for you if you’re only using a point-and-shoot digital camera – but if you’re ever going to get into film, it’s gold).

OK, so how does ISO effect your end result? Noise. It adds photographic noise.  The dimpled effect in photos when you zoom in & see incomplete data.  As a general rule of thumb, the lower the ISO, the less noise.  However, the lower the noise the slower the photograph.  Remember in yesterday’s post how I mentioned that you can’t control shutter speed on this guy? Well, the lower the ISO, the slower the shutter speed, and the blurrier things get.

So the real-life rule: you want to use as low an ISO as possible for the given amount of light.  Rough examples that I use:

  • Outdoors, sunny (or even cloudy) day: ISO 50.
  • Indoors, daytime, sunny or cloudy with shades open: ISO 100.
  • Indoors, shades closed during the day, but with bleed-through: ISO 200.
  • Outdoors, dusk: ISO 200 (I’ll often start at ISO 100, though).
  • Indoors, night: ISO 200 (sometimes have to go to ISO 400).
  • Indoors or outdoors, From October through March, anytime that’s not between 10am and 3pm: 200 ISO, often dropping to 400.

Notice how I only go to ISO 400 when I’m out of options?  That’s because I don’t usually carry a tripod with me when I’m using this camera.  I almost always have the flash disabled, so I need all the speed I can get.

Buttons & switches on the sd500. Note the "SCM" and "M" buttons.

Buttons & switches on the sd500. Note the "SCM" and "M" buttons.

ISO 400 is the fastest this camera can go.  It’s not too bad, but in low light (think normal indoor light at night) it gets pretty noisy.  This varies from camera to camera, mind you: my SLR does fine up to ISO 800, then spits out pretty nasty garbage.

To get to the ISO menu?  First, set the dial to “M” (for “manual”!).  then click the “FUNC” button – look to the right for a display (click for a larger view).  Now, use the buttons around the FUNC button to move down to ISO, then left & right to set it where you want.

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Shifting out of Auto

Sunday, April 19th, 2009

When dealing with a camera with such a small sensor, I find that I can’t rely on the auto settings in any way.  They kinda work if you’re only interested in snapshots. You know the type: flash in normal conditions that blows out the subject and darkens the room, something that really doesn’t make the pics good, just good enough. Auto mode on this camera isn’t even used when my 4-year-old picks it up!

It does a somewhat decent job when taking outdoor photographs in bright sunlight, though.   Unless the light is behind the subject.  Normally.

Auto is just hard to predict.  You’re much better suited to shift either into scenic or manual mode.

Scenic Mode

Buttons & switches on the sd500. Note the "SCM" and "M" buttons.

Buttons & switches on the sd500. Note the "SCN" and "M" buttons.

Most cameras have a scenic mode.  Some have several: lower-end DSLRs tend to have “sports”, “portraits”, “beach”, etc.  settings.  The sd-like series are no different – except that it’s a single scenic mode, and you toggle a menu setting to get to your desired setting.  I may write about this someday, but that’s not the topic I’d like to cover today.

To the right: “SCN” is the “Scenic Mode” option on the sd500.  Dial “M” for “Manual.”

Manual Mode

They can call it “manual” all they want, but it really isn’t.  I consider it more of an “almost manual” mode, or an “advanced scenic”.  Why?  Well, it’s somewhat limited.  You can’t set your own F-stop, nor can you control shutter speed.  You can, however, control ISO, white balance, exposure values, and a few other (lesser-used) settings.

Again, it’s not really manual, but it’s as close as you can get without hacking the firmware.

And that will introduce you to the next series of posts: why I care about customizing the settings.  Coming up:

  • ISO – why I care & where I usually set it.
  • White Balance – what I use & when. Also, how I customize it.
  • Exposure Value compensation – where I leave it and why.
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Mid-Winter’s Ski Pic

Saturday, April 18th, 2009

A snapshot from the Winter of 2007-2008.  Mid-winter, and an HDR built from 3 exposures.  Think about that: this is an HDR image, which should be showing a huge amount of detail.  Saturation is turned way up, yet it’s still all grey.  This wasn’t just an overcast day, mind you – it’s just like this throughout parts of the winter.  Ice fog, clouds, smoke…

A Mid-Winter's Ski, Early 2008

A Mid-Winter's Ski, Early 2008

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Pictures in the Snow

Friday, April 17th, 2009
Jogging the trails in Anchorage

Jogging the trails in Anchorage

Looking back at yesterday’s post, you’ll see one of the joys of snapping photos in Alaska.  Wide extremes of light, with a lot of lighter tones.  Snow.  We have it for nearly half the year, sometimes more than half a year.

And the colors: they’re definately muted.  Lots of greys, not much in the way of intense color for 3-4 months running.  Perhaps I’ll post one of those pics tomorrow.

The trade-off?  Lots of low-angle light.  The golden hour doesn’t last 15 minutes, like it does in warmer areas – I’ve seen it last nearly two hours at times.

So, how to avoid blowing out the highlights?  Surprisingly, the sd500 does a good job of not overexposing.  Unfortunately, it turns the whites to greys.

My technique: set the camera to Manual (which isn’t really manual), and push it down to ISO 50 (the slowest it goes).  Alter exposure to -1/3 EV (slightly faster, slightly darker photo), which will preserve all highlights.  Change metering to spot metering, and meter on one of the brighter areas (an area I care about).  Don’t worry about blowing out the highlights on snow – we all know what snow is, we don’t need to see detail.

Now, the photo will come back a little muted.  Using Bridge, bump up the exposure until it’s more-or-less the overall brightness desired, then tweak fill light & blacks (occasionally recovery, if you want detail in the snow) until you’re where you want to be.

Think I’m significantly altering the photo?  Not really – the original is slightly less contrasty, with slightly more grey in the snow and less blue in the shadows. That’s the camera’s interpretation of a snow scene, I’m just pulling it back to the real world.

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JPG vs. RAW, according to a chimp (pt. 3)

Wednesday, April 15th, 2009

OK, last word on JPG vs. RAW, I promise!  Really, just a summary:

JPG

Pros:

  • Smaller file size;
  • Don’t need to process much to share with friends, family;
  • Tends to do a pretty good job of processing;

Cons:

  • Still needs some post-processing, especially if you resize images;
  • Loses some detail in the image;

RAW

Pros:

  • Captures far more detail;
  • Gives you a chance to recover images that would be unfixable in JPG;
  • Wider range of post-processing options;

Cons:

  • They’re large – huge, even – requiring a lot of space for storing;
  • They’re slow to process, due to the large size;
  • Post-processing is required, which takes time

My Approach

So how do I do it? It depends on the camera, in fact.  On my SLR, I only take RAW photos.  I’m going for quality with that guy.  My sd500? I take both RAW and JPG files.  I have no choice, in fact – when I enable RAW format on that guy, he won’t stop taking JPGs.  Oh, and that’s not a typo if you recall the specs from a couple days ago – even though Canon claims it only outputs JPGs, there’s a way around that.  I’ll get into that another day.

Any other camera?  Depends.  If it’s really high resolution & I’m in a flat lighting environment, I’ll probably stick to JPG. Once things even start feeling extreme, I shift to RAW.

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JPG vs. RAW, according to a chimp (pt. 1)

Monday, April 13th, 2009

If you’re relatively new to photography or just use your camera on the basic settings, then you’ve always gotten your photos in JPG format.  It doesn’t really matter if you know what the JPG format is.  What is important is that you can take the pictures directly out of your camera, resize them some way, and post them either to your photo-sharing site of choice (like Flickr) or email away.

Biking Anchorage's trails in the fall of 2000

Biking Anchorage's trails in the fall of 2000

JPG files are already processed somewhat by the camera’s internal programming.  This can be good, but you actually lose a little bit of detail.  JPG is lossey, which is to say that it compresses the image to a point that the image loses a little bit of detail (in favor of smaller image size).  If you keep working over a JPG image, you can end up with something that’s pretty ugly.

Check out the photo to the right, for example.  Looks good at the small in-screen size, but click on it & see it at a medium size.  Pretty blocky – a lot of detail lost in the tree, and the sky is somewhat… blotchy.  This was a pic from an old Kodak camera – one of the first digital cameras – and it was glorious for its day.  But the lossey compression right out of the camera really did a number on it.

So, I currently use the Canon sd500 for tooling around.  A short summary about formats from Canon’s spec sheet on the camera:

  • Image Compression: Still: Exif 2.2 (JPEG); Movies: AVI (Image data: Motion JPEG; Audio data: WAVE (Monaural))
  • JPEG Compression Mode: Normal, Fine, SuperFine
  • Print Order Format: Design rule for camera file system Exif 2.2 (JPEG) and DPOF (Version 1.1) compliant

This translates to: the sd500 only takes JPG images.  Much higher quality ones, mind you – every pic I’ve shown on this site from that camera (so far) has been processed out of the JPG.  However, I can’t rely on that.  You see, RAW image format holds much more information.  No more “camera decided to blow out the clouds” pictures (like the above pic).  The info is there, but you have to run post processing to pull it out.

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Night Shots…

Saturday, April 11th, 2009
Night shot (technically morning) of traffic December

Night shot (sorta) of traffic December

…And slow shutter speeds.  This is something that’s typically the domain of SLRs, not cruddy point-and-shoot cameras.  And yet, here we are.

Under normal circumstances, it’s easy enough to get a slow shutter speed – just turn off the flash in a dark area.  In this case, that wouldn’t have worked.  To capture the ambient light as dark as I wanted (which is to say, as it was, not as the camera wanted to interpret it), I had to override the shutter speed, make it slightly faster than the sensor wanted to.

How?  Well, I could have (and did) used a faster ISO.  Maxed that out, but it was too fast.  So I used a known hack (CHDK project) to manually control the shutter speed.  This was taken at 1/15th of a second, f/2.8 at the widest angle settings of the lens.

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Last words on the equipment

Tuesday, April 7th, 2009

OK, this is the last thing I’ll say about the equipment, I promise!  Just a point about how easy it has been to pack around and use. Outside of being an important tool for documenting my child as she grows (and that is the main reason for having it), it has also served me well in a variety of places:

  • Scuba diving in Hawaii;
  • Hiking/mountain climbing (sorta) in Alaska;
  • Cruising the Carribean on the east, Mexico on the west;
  • Bermuda, both in the ocean and around the islands;
  • The Cascades in Washington;
  • SoCal;
  • The beaches of Maui, Oahu, and Hawaii (big island – and it went through the sulfur springs of the volcano);
  • Blizzard ski trips in Anchorage;
  • Pouring thunderstorms in Florida (technically, the outer edges of hurricane Katrina, before it headed towards NO);

I do have an SLR, and I definitely prefer its quality.  But this is the camera that I usually have with me when I’m not planning on taking pics.

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