Expodisc, index cards and other herbs Grey
this holder could also post "herbs to the white balance" but I greatly fear that such a title might give rise to more than one interpretation ...
Well, when we took on RAW in general we can not worry about white balance and adjust then to reveal the raw, choosing a white or neutral tone is often revealing to achieve satisfactory results. When this is not enough other methods based on the post-processing of the image can correct any color cast that has our image. On these methods discussed in another article.
The question today is how to achieve a good white balance the camera. This is necessary for those who take only in JPG or even in those situations in which the lighting and colors are complex and require a perfect representation of color, portraits, product and architectural photography as well as landscapes are complex light situations which may need an appropriate white balance in-situ.
In theory we are in a situation in which the complexity of light makes the Auto-WB of the camera is not reliable. Note that is not the same reliable than satisfactory, often the Auto-WB produces results that look good but do not adequately represent the real color of the scene, as mentioned in photo product or architecture if the colors are not real does not matter if it looks good.
then 2 We will discuss tools for setting the WB in-situ when we can not rely on the camera: The gray and Exposure index cards.
cards
gray gray cards are cards that are painted a neutral gray color so that they can be used as the camera's Custom WB and veridical represent colors according to the light in the scene. They are inexpensive and come in many forms but ultimately not a card no longer gray.
To use this card you do is put in front of our lens, blurring so that the card covers the percentage of need according to our camera frame (usually less than 50%), took a picture of card and then use this photo as "custom white balance." The way that sets the Custom WB depends on camera so we must refer to the manual with it. Advantages and disadvantages
:
+ price and size.
- is susceptible to glare, avoid at all costs that occur when taking the photo highlights of WB.
- If the light is complex and comes from several directions the card can not grasp.
- Light the scene is different from the light where is the camera will not work
For the best quality cards that are the WhiBal .
The ExpoDisc ExpoDisc
The is a translucent disk that is placed as if the lens cap and used to take a neutral image based on light from the scene.
is totally different from the gray card as the ExpoDisc is based on incident light rather than reflected light. We put the gray card for the camera pointing to our scene and we took a picture of the card, it measured the light reflected from the surface of the card supposedly neutral. To use the ExpoDisc we have to aim the camera with the ExpoDisc placed in the opposite direction ie towards the scene where the light comes and not to where we took the photo. This measures the incident light in which we will use the ExpoDisc Custom WB soon as the camera.
The advantages and disadvantages of the ExpoDisc are
+ measures the light incident from any direction
+ is not susceptible to glare
- Price
- If light on where the camera is different from the light in the scene simply does not work
In short, when the light in the scene is different from the light in which is mounted the camara no solution, we must "get right" or correct the WB in post-processing. When the light matches both the ExpoDisc can serve as the card, the ExpoDisc is best when the light is complex and comes from different directions and at different qualities. The card is perfectly usable when the light is even and we can avoid reflection.
0 comments:
Post a Comment