Sokol
Topic Author
Posts: 246
Joined: Sun Apr 22, 2001 4:33 pm

When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 5:24 am

Hello all,

When I take shots with my digital camera Canon PowerShot S30 on cloudy day why they get so dark ? This is the setting I use ISO 10, Mode TV, 1/640, F4.9 some times higher.

so is that right setting or not ?
 
PRM
Posts: 326
Joined: Thu Apr 25, 2002 12:17 am

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 5:51 am

Sokol,

If it's overcast cloudy conditions and you used ISO100 (rather than ISO10 in your post which I assume is a typo) then 1/640th at F4.9 sounds like quite a short exposure time to get well exposed shots......I would have thought the metering would have given you something in the ballpark of 1/250th at F4.9......if we assume general cloudy conditions.

If correct, that would explain your dark problem as being underexposure.....problem with the metering?

Paul
 
Sokol
Topic Author
Posts: 246
Joined: Sun Apr 22, 2001 4:33 pm

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 8:52 am

I am sorry it is ISO 100 not ISO 10.

Paul if I change it 1/250th you think it will be more lighter or same as before dark ? I would ask Zurich photographers what setting they use because in Zurich most of the time it's cloudy, foggy, raining....

Zurich Photographers please help me for that


-Sokol-
 
Sokol
Topic Author
Posts: 246
Joined: Sun Apr 22, 2001 4:33 pm

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 11:53 am

They look same like this picture , same weather, darker.


View Large View Medium
Click here for bigger photo!

Photo © Grahame Hutchison



All you guys please try help me for this problem, show me what to do so when I take pictures it wont be dark like that.
 
PRM
Posts: 326
Joined: Thu Apr 25, 2002 12:17 am

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 7:52 pm

You could try taking a few shots in sequence the next time the weather is dull overcast all at F4.5 - perhaps 1/250th as you suggest, 1/350th and 1/500 and this should allow you to get one correctly exposed.

Bear in mind that a smaller aperture would help increase the depth of field and keep the whole plane sharp if your shooting approaches (something like F6.7 or F8) but at the expense of shutter speed - so you really need brighter weather to allow you to keep using a faster shutter speed.

P
 
pepef
Posts: 412
Joined: Sat Oct 26, 2002 3:12 pm

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 10:01 pm

The plane in this picture was much darker than your plane in your picture to begin with:


View Large View Medium
Click here for bigger photo!

Photo © Peter Fagerström



If you have access to Photoshop, learn to draw a path around the plane. It takes some skill to do it properly, and a considerable amount of time.
Next, convert the path into a selection. Once you have a selection remove the path.

Now you have a selection of just the plane. Adjust curves and contrast. It only affects the selection. Ie. the plane.

Invert the selection. Now everything is selected except the plane. Make the background a bit darker if you wish so the plane stands out better.

Invert the selection again, now the plane is selected. Apply unsharp mask. Now the unsharp mask applies only to the plane, the background stays unaffected. And so on.

-Peter
 
pepef
Posts: 412
Joined: Sat Oct 26, 2002 3:12 pm

RE: When I Take Shots Why They Get So Dark

Wed Dec 04, 2002 10:43 pm

P.S. If I remember correctly the picture above was my first picture on Airliners.Net, so don't jugde too harshly. It is also poorly done, it just illustrates the point that something CAN be done.

My skills have improved considerably since that first upload, and I'm no Photoshop guru. So give it a go.

-Peter-
 
Pixair
Posts: 4
Joined: Wed Jan 24, 2001 11:34 pm

RE: When I Take Shots Why They Get So Dark

Thu Dec 05, 2002 4:50 am

This is a problem of a correct exposure and depends on the measurement method (integral, spot, ...) and the light reflected from the object. In general the high contrast, strong reflections and highlights from the airliner tells the camera meter to much light. Using slides an exposure compensation of +0.5EV or more helps (or set the ISO value for an ISO 100 film to 64 or 50).
Incorrect exposure results in poor quality which can be hardly corrected later with an application like Photoshop ...

Robert
 
Sokol
Topic Author
Posts: 246
Joined: Sun Apr 22, 2001 4:33 pm

RE: When I Take Shots Why They Get So Dark

Thu Dec 05, 2002 6:41 am

Hi all

Thanks for helping....  Smile

I tried all you showed me Mode TV, ISO 100, 1/320th and 1/250, F4.9 but it wont work
it does the same as before, clouds in the background looks lighter airplane darker. !!

I would like to show you one shot but I will send you e-mail to see that shot.
go check live in Anchorage Airport so you can see the weather overcast and i hope you will find out why my Canon S30 does that.
http://www.dot.state.ak.us/anc/livecam.html

-Sokol
 
PRM
Posts: 326
Joined: Thu Apr 25, 2002 12:17 am

RE: When I Take Shots Why They Get So Dark

Thu Dec 05, 2002 6:13 pm

Sokol,

Does the Canon S30 have the option for spot metering? Do you use some form of matrix metering or centre weighted? Do you have the facility to be able to stop up/down (exposure compensation)?

Play aroud with the different types of metering and some exposure compensation on different shots in the same light and see if this helps.

If you could spot meter on the fuselage of the plane this should at least give you the chance to get the aircraft correctly exposed.

Paul
 
Craigy
Posts: 1076
Joined: Sun Jun 03, 2001 6:24 am

RE: When I Take Shots Why They Get So Dark

Fri Dec 06, 2002 2:27 am

Sokol,
Try this.....
With your arm outstretched, take a photo of the palm of your hand. Note the settings used and then use the camera in manual mode (if it has one) with these settings.

When the camera tries to meter the scene, it doesn't know what it is looking at, so it will try to meter a bright sky or a colourful landscape the same way. It does this by assuming that the average light over the whole scene is that of medium grey. If course with a bright sky and white aircraft this is not the case, but the camera does not know this, so it darkens the whole scene. As the sky is VERY bright, it darkens too much resulting in a poorly exposed aircraft. Even on overcast days, clouds are still very bright as they reflect a lot of light.

To allow more light into the camera, you need to have a slower shutter speed and/or larger apperture (F number).

Hope this explanation helps you to understand what is going on here.

Regards,
Craig.

Who is online

Users browsing this forum: No registered users and 6 guests