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Light box (Read 1045 times)
leo Makepeace
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Light box
10/11/11 at 10:21:44
 
Hi Y'all,

I am trying to find out why my pictures are coming out with a pinkish tint to them. I use white background, could it be the bulbs ( normal lamp bulbs ?? ) If its the camera, then I really do have a problem Embarrassed

All comments / advice appeciated. dankk2 dankk2 beer beer

Leo Cool
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Kerry Burton
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Re: Light box
Reply #1 - 10/11/11 at 12:03:53
 
My guess is "white balance".

Most cameras have built-in settings for incandescent, fluorescent, sunlight, etc ... as well as an "Auto" setting.

My by-no-means-super-fancy, point-and-shoot camera allows me to set a "custom" white balance setting.  That's really helpful if you're getting mixed light from different bulb types, or there's something else that's lending unwanted color to the scene.

Before I shoot any pics of my projects, I get the lighting and everything set up.  Then I hold a sheet of white copy paper right in front of the project so the same light is falling on it ... and set my custom white balance that way.

If you post the make and model of your camera, I can try to find an online manual and see what features it has, and whether you can apply this kind of custom white balance setting.  Otherwise, I would say to just try the various built-in settings and see which one looks best.
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leo Makepeace
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Re: Light box
Reply #2 - 10/11/11 at 12:50:42
 
thanks Kerry,I will have a look at the very basic instructions and get back to you.!!

Leo
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leo Makepeace
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Re: Light box
Reply #3 - 10/11/11 at 13:38:36
 
Kerry,

Sorry to be an idiot, but I am having a lot of problems, I haven't got a clue what I am looking for in the instructions. I have been having picture problems for a long time. i did find an incandescent etc. mode, but it didn't help much ! No custom white balance though Embarrassed

I have an Olympus FE-5000 10 megapixel camera and a Canon Powershot A470 7.1 /mpixel camera., there is plenty of menu's and I have to be honest, I have not got a clue.

If you could have a look for me, you would be helping me more than you will ever know. Thank you very much.

Leo
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« Last Edit: 10/11/11 at 13:41:57 by leo Makepeace »  

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Re: Light box
Reply #4 - 10/11/11 at 15:17:00
 
Leo, where you found incandescent, etc., that is the light balance area.  Set up your light box and lights, take the same picture with the light balance at a different setting for each one.  See which one is the most realistic.  It really is as easy as that.  You may want to mark it down so that you remember the next time.
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leo Makepeace
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Re: Light box
Reply #5 - 10/11/11 at 16:05:25
 
Getting better with help from my friends,I have it clearer, but not white, as in the pic. below. It is also on fine, but only uses 140 kb. not the expected 1 or 2 mb. and the pic looks grainy, I have ( for the first time ) got spectacles so can see too much now  Wink so I can see all the mistakes that I have madeover the last couple of years and " YIPES " have I made a few  Embarrassed

Thanks again,


Leo
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Kerry Burton
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Re: Light box
Reply #6 - 10/11/11 at 16:10:39
 
For the Canon, it looks like pages 86 and 87 in the Camera User Guide are what you need.

Note that the top dial on the back of the camera needs to be set at "camera M" for "Manual" mode.  (In Auto mode, the camera does everything for you and you can't customize much of anything.)

Similar to what Doug said, scroll through the various white balance modes and compare the different "looks".  If one looks better than the others for your setup, choose it and use it.

If you'd like to try the Custom setting (just to see if it's better than any of the "pre-set" ones) go to page 87.   Follow the few steps exactly, and you'll be golden. 

IMPORTANT:  If you're like me, you will forget to set the White Balance back to AWB (Auto White Balance) for regular snapshots.  The easiest thing to do is turn the top dial on the back of the camera back to "camera" (Auto) mode.  If you always shoot your woodworking projects under the same conditions, just turn the dial to "camera M" for that, and back to "camera" when you're done.  thumbsup

The last 3 cameras I bought have been PowerShots - an A520, an A540 and an A590IS.  That's why I checked the Canon manual.  If you'd like me to investigate the Olympus, let me know.

BTW, 3 other tips:
  • Use a tripod!  (Even a pocket-sized one.)
  • For close-ups (within, say, 16 inches) press the "flower" button to use "macro" mode and keep the focus sharp.
  • Use the 2-second self-timer to eliminate the camera shake that occurs when you press the shutter button to take the picture -- especially in low light. (See page 62.)
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Kerry Burton
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Re: Light box
Reply #7 - 10/11/11 at 16:19:39
 
leo Makepeace wrote on 10/11/11 at 16:05:25:
It is also on fine, but only uses 140 kb. not the expected 1 or 2 mb. and the pic looks grainy

Looks like I was a few minutes late with my last post.  Sad

You mentioned "Fine", which is a compression setting ... but not the "Image Size" setting (L / M1 / M2 / M3 / S).

The first one says how much detail will be retained in the image; the second is how big you want the actual image to be.  I'm guessing that you have it set to S or one of the smaller M sizes.

The "grainy-ness" could also be a result of viewing a fine-but-small image at full screen on your computer.  In that case, the software has to generate extra dots that don't exist in the original image ... and there's just about no way to do that well.
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« Last Edit: 10/11/11 at 16:20:36 by Kerry Burton »  
 
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Roger_Smith
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Re: Light box
Reply #8 - 10/11/11 at 18:09:47
 
Leo,  do you have two or more different types of lights?  Are you using a flash?  The WB is a little "warm" indicated by the pink/red tones.  Too cool and it develops a blue tint.
You may try some of the bright white floresent bulbs if you are using incandescent bulbs.  That should help the problem.

Graininess in the second photo is caused by a high ISO setting.  First photo was taken ISO=80 and the second ISO=800.  High ISO produces "noise" in the photograph.  Did you have less light with the last photo?  ISO is how sensitive the camera's sensor is to light.
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leo Makepeace
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Re: Light box
Reply #9 - 10/12/11 at 02:04:04
 
Thank you all for such precise information, it would take weeks of me looking through the book to find and then of course to understand what I was reading.

Kerry I will stay with the canon and thank you so much for your help.

Roger,
ISO., so I need a low ISO. to cut down on the grainy look ??
i am just using a couple or three of those lights on an arm, desk or workshop ones, no special bulbs, I must get some spot lights ? just small ones ?

Thanks all again,

Leo Smiley Embarrassed
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Re: Light box
Reply #10 - 10/12/11 at 05:38:52
 
Leo, first try those compack fluorescent bulbs in your current lamps.

There are 3 things that work together to capture the light.  The size of the opening in the lens, the sensitivity to light (ISO) and the amount of time the lens remains open.  If you increase the ISO, then the amount of time the lens is open to light is reduced.  If you set the ISO to a lower number, then the lens must remain open longer to capture the light.  Since  we are shooting a static non-moving subject, we will be OK with a slow shutter speed if we have the camera stable.  You must have a tripod or the pictures will be blurry.

My suggestion; 
a.  shoot from a tripod
b.  get bright white CFLs and set the WB to fluorescent H
c.  search through the Tutorials, Projects and Tips for photography.  There are several good articles there.
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leo Makepeace
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Re: Light box
Reply #11 - 10/12/11 at 10:23:02
 
Thank you Roger,

I am spending most of today practising and learning, this is very important stuff, if you/I want to sell pieces on the web.


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leo Makepeace
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Re: Light box
Reply #12 - 10/13/11 at 10:59:57
 
Sorry for going quiet on this topic for a while, I am still learning and testing. OMG. it looks so easy  Huh

Leo
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Chuck Beland
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Re: Light box
Reply #13 - 10/14/11 at 03:28:25
 
Leo,
So does turning when you see guys like Bob H & others here using the tools. you say that's not that hard, then you grab a gouge & constantly screw up.  Grin
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leo Makepeace
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Re: Light box
Reply #14 - 10/14/11 at 15:53:55
 
You are so right Chuck, I must video all of my turning, so I can show you just how often I screw up...........maybe not enough storage memory on the site for that many screw up vids. !!!!!

Leo
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