joi, 25 august 2011
8/25/2011 lupu victor No comments
Name: Gamma correction and the Moon seas
Photographer: Victor Lupu
Optics: Celestron C8-Newtonian telescope, plossl 20mm, 2x Barlow
Mount: CG5 (EQ5)
Device: Sony CX105 at 3x optical zoom
Total magnification: 300x
Focal diameter: 1"25
Location: Baia Mare, Romania
Processing: video captures, FastStone Image Viewer
From these images I wanted to catch as many highlight contrast is observed on the lunar soil. And the most obvious differences in soil composition can be seen on the Mare Serenitatis and Tranquillitatis. Between the two there is a big difference between each soil composition. The border of this seas can be seen with the naked eye as Mare Serenitatis (or Sea of Serenity) consists of a different ground, lighter, than Mare Tranquillitatis (or Sea of Tranquillity), which has a darker color . This difference can not be seen unless you subtract the amount of gamma of the photo or video because the light blocks some details that the Moon has. And why say that?
Gamma correction in video or photo editing programs is the name of a nonlinear operation used to decode the brightness of an image either photo or video.In this procedure you can lighten a dark picture to get some details not seen in the original, or to darken the image too bright, to bring out details of a photo.
For example: shoot your hand in the sun with a camera. Insert picture in a photo editing program that has the option of correcting gamma. Decrease the level of gamma and you will see that the main veins of your hand are more obvious.That details were not visible even if you would decrease the normal brightness of the image. In these images of the article I decreased gamma.You will see that out of the blue, colors appear, that are undetectable in the original photo because it was too bright.
IMAGES AND VIDEOS
About me (8) Astronomical Phylosophy (5) Astronomy Labels (1) Astronomy terms (5) Craters-Reinhold and Lansberg (2) Craters-Santbech (4) DSLR astronomy pictures (4) DSLR Hyperion pictures (4) DSLR telescope pictures (20) Occultations (5) Rima Ariadaeus (3) Rupes Altai (9) The colours of the Moon (7) Things about the Moon (8) Weird sightings (8)