PLAYING WITH HDR
H.D.R. known as High Dynamic Range, Is graphical representation which have higher Detail Range in either the Lowlight region and the highlight region. It is also assume to be nearer to true vision, and usually used in Gaming to produce Extremely Detail and Better than Reality graphis.
The idea is simple why HDR is special. In normal vision, either by eyes or by sensor of digital camera, there is always a range where the image is been captured. Compare with a normal camera and our eye, we always felt that what we capture is not what we see. we feel that image capture by the camera is less real than the moment we see it. It will be like lossing certain detail. That is the Dynamic Range diffrent between our eye and the camera. The camera have low Dynamic Range than our eye.
However, certain high end Camera can produce more detail and vivid color image than what we see at that moment. Hence the Dynamic Range of that camera will be higher than our eye at that moment. It is still a limitation between the eye and the camera. It cant Capture what it cannot "SEE". In the end it still depends on the propertiess of what capture the source of light at that moment.
Yup. It cannot Capture what it cannot see.
Have you ever feel that during unfavour condition, such as backlighting of a subject, where the strong light source is from the back of the subject of interest such as a person, the eye can only focus on one at a time. if you want to see what is behind the person, you will find that the background is clear dispite the strong light, but the person or the subject gets darken and lossing all the detail. This is when you pipil constricted and sensitivity of retina reduced. However if we want to see the subject, the background will be over exposed , and goes white, as the pupil is dilated a little and increase sensitivity of the retina. hence the dark region of the image is clear. Hence you wonder if you can superimpose the two image to produce an image which is an allrounder, in dark and bright region. Sometimes it is true that you cant focus on too much detail at the same time f it is in its extreme, dark and bright. With HDR, you can improve the range of detail under view.
However, if your camera have low dynamic range, or you are not happy with the dynamic range of your camera, you can take several exposure to get all the possible range of detail and composed with a HDR generator in Photoshop CS or a simple PhotoMatrix Pro.
All the image with all the diffrent detail range can be supperimposed and processed to produce a High Dynamic Range which is much higher than the camera. All the exposure must be of the same and identical image.
A HDR image is produced by PhotoMatrix. This is the compound of my campus, from what i viewed from my window. The color looks very vivid and the detail range is very high. It is near to true vision, but since it is reproduced, the strength of light is diffrent from what it should be at that moment.
The Three image i take to produce a HDR image.
This is an Over exposure frame of image. As you can see, the high light area are totally overexposed, leaving the low light area (such as shadows) become more detailed.
The Color Histogram of the basic color, Red - Green - Blue, is skewed to the left.
This is an Over exposure frame of image. As you can see, the high light area are totally overexposed, leaving the low light area (such as shadows) become more detailed.
The Color Histogram of the basic color, Red - Green - Blue, is skewed to the left.
This is a Normal Exposed Image. This is what a camera should see at its optimum settings. The image is averagely produced and there is less detail in both extreme , the bright sky and the dark shadow.
The color histogram have more a less centered.
In an uderexposed image, the detail in dark area is totally unrecognised. However the cloud of the bright sky can now be clearly see. The Bright area which is previously not hightlighed is highlighted.
The Color Histogram skew to the right.
The Final Image been reproduce have both the detail of the low light area (shadows) and high loght area (Clouds).
The Final Image been reproduce have both the detail of the low light area (shadows) and high loght area (Clouds).
The Color Histogram is now a normal distribution. this is what we suposed to see. Not over exposed nor underexposed.
Now , the question is how to get 3 or more diffrent exposure of the same sence? Simple, any camera that can do exposure compensation , or even better with DSLR cameras that can take few sucessive shot with diffrent exposure values with just a click. It is called auto exposure bracketting.
Anyway, i am just a begineer in HDR, so more to be improved. This is my first sucessive HDR generating using Photomatrix.
