.Exposure | Chroma Key Software exposure

Posts Tagged ‘exposure’

postheadericon Making More of Flash

With the addition of the ambient light instead of totally replacing it, on-camera flash can achieve interesting effects, and even subtlety. Experimentation is less complicated than ever before with digital camera models.

While on-camera flash works well enough as the no-frills light that at the least helps you to capture a recognizable image, it totally changes the view of any scene, usually dropping the backdrop straight out of sight. Approaches of working around this, however, including diffusing the light and employing it combined with an extended exposure. Modest number of diffusion is achievable by fitting a translucent attachment into the flash head, but you will find physical limits to this particular because the diffuser attachment has got to sit through the lens. More usual in interiors with low, domestic-style ceilings is by using bounce flash, swiveling the head upwards in order that the light spreads by reflection (simply with white or pale ceilings).

Contributing to the ambient light, however, is among the best reasons like on-camera flash, and there are a couple of variations from it. The first is shadow fill. This is especially useful shooting towards light and detail in objects facing the camera is frequently lost in shadow. All digicams have got a setting for this, where a smaller dose of flash is boost the longer exposure to be able to provide a balanced combination. The other variation is streaking with rear-curtain synchronization. In this particular, the exposure and flash output are similarly balanced, however the flash is timed by the end of the exposure. If you experience movement, in the subject or because you slowly move the camera, you’ll encounter trails of light terminating in a sharply frozen image.

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postheadericon Bright Cloudy Skies

Unless the sky is a rich, deep blue, the contrast between it and the ground is likely to be very high, to the point where it appears washed out. In landscapes and other views that included the horizon, 100% cloud cover alters the tonal relationship between sky and land. Without cloud, the difference in brightness between the two is usually fairly small; quite often, the subjects are lighter in tone. This is not the situation when cloud extends all over the scene. Then the cloud cover is the light source and, if you include it in the view, you will have a contrast problem. In other words, if the scene includes the horizon, you will inevitably lose detail either in the sky or in the ground. If the subjects or the ground are properly exposed, the sky will be white, without any visible texture to the clouds.

 

Many photographers simply avoid including the horizon and sky in a shot under these conditions, but you may occasionally find that you have no choice. One answer during shooting is to use a neutral density graduated filter over the lens, aligning the soft edge of the filter’s darkened area with the horizon line, so that the sky is made darker.

 

There is also a purely digital answer, which works best if you use a tripod and can keep the framing perfectly steady. Make two exposures, one good for the subjects on the ground, the other good for the sky (dark enough to show cloud texture). Later, in an image-editing program, the ground from one and sky from the other can be combined to get the best of both worlds.

 

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postheadericon Twilight Photography

With the sun below the horizon, it is the afterglow that lights the scene, often with a surprising delicacy not found under any other conditions.

 

Like the normal daytime skylight, twilight is a reflected light source, but is rather more complex in its effects. It is the light that appears a little before sunrise (“first light”) and that remains for a short time once the sun has set. In a clear sky, the intensity shades smoothly upwards from the horizon, where it’s brightest, and outwards from the direction of the sun. (The studio equivalent is a light placed on the floor, aimed up towards a white wall, and used as back lighting.) The sky, in fact, acts partly as a diffuser and partly as reflector. The actual light levels vary considerably from a just-discernible glow to actual sunset or sunrise.

 

These conditions allow a fairly wide choice of exposure. If you are shooting directly towards the twilight, you can try a short exposure in order to make a silhouette of the horizon and subject. In this kind of back-lit shot, the shading of the sky from bright to dark gives some choice of exposure, particularly if you use a wide-angle lens. Less exposure intensifies the color and concentrates the view close to the horizon. More exposure dilutes the color in the lowee part of the sky, but shows more of the higher, bluer parts. In other words, increasing the exposure extends the area of the subject within the frame. A range of exposures is acceptable, depending on what kind of effect you are trying to achieve from the photograph.

 

Not only does the brightness shade upwards from the horizon, but the color does also. The exact colors depend on local atmospheric conditions, and different light-scattering effects are combined in a twilight sky. At a distance form brightest area-opposite and above-the color temperature is high, as it would be during the day. Close to the horizon in the direction of the light, however, the scattering creates the warmer colors at the lower end of the color temperature range: yellow, orange and red. These merge in a graded scale of color.

 

UPDATED! Green Screen Wizard Full Version 7.0 offers the latest in green and BLUE screen software power and control behind an amazingly simple and accessible user interface. This chroma key software provides professional photographers, as well as photography enthusiasts, a simple way to do green screen removal and substitutes their choice of digital background. Green Screen Wizard is a self-contained chroma key removal program that does not require Photoshop or other photo editing application to produce beautiful green screen photos. Learn more now and try a free demo version!

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