Glossary

Exif (Exchangable Image File Format)

A standard digital camera file format established by the Japan Electronics and Information Technology Industries Association (JEITA).

Gradation

The total contrast range of an image. Also the range of light and dark tones in a scene that a camera sensor is capable of registering.

Histogram

A graph that shows the darkest and brightest points in an image. The horizontal axis represents the brightness and the vertical axis represents the number of pixels. This is useful when you wish to refer to the exposure status of an image.

Image Resolution

The term image resolution refers to the number of pixels in a digital photo. You can get a large picture in good condition with high-resolution.

Image Quality

Image quality is affected by the compression rate of the digital image. A high-quality photo has a low compression rate.

ISO Sensitivity

The sensitivity of the camera to light; the equivalent of film speed in a camera using film. With a high sensitivity, images can be shot with a high shutter speed even in dimly lit places, reducing camera shake. However, images with high sensitivity are more susceptible to noise.

JPEG (Joint Photographic Experts Group)

An image compression method. The image is recorded in JPEG format when the quality level is set to (Super fine (1)), (Super fine (2)), (Fine), or (Good). Images recorded in JPEG format are suitable for viewing on your PC or for attaching to e-mail.

ND (Neutral Density) Filter

A filter which reduces the amount of light entering the camera lens by a measured amount, without affecting the picture itself.

Noise Reduction

Process to reduce noise (image roughness or unevenness) caused by slow shutter speed.

NTSC/PAL

These are video output formats. NTSC is mainly used in Japan, North America, and South Korea. PAL is mainly used in Europe and in China.

RAW data

Unedited image data output from the CCD. RAW data is data before being internally processed by the camera. Settings like White balance, contrast, saturation and sharpness can be manipulated individually on each file. In addition, RAW data is 12-bit data that contains 16 times the information of 8-bit JPEG and TIFF data. Rich gradations are possible. Transfer RAW data to your computer and use the provided software to create image data with different settings, such as JPEG or TIFF.

sRGB (Standard RGB)

International standard of colour space established by the IEC (International Electrotechnical Commission). This is defined from colour space for PC monitors and is also used as the standard colour space for Exif.

Shutter Speed

The total exposure is proportional to the shutter speed. A fast shutter speed can capture a stopped motion of a moving subject.

Vignetting

Vignetting occurs when corners of pictures are darkened because the subject was blocked by the hood or filter or the flash was blocked.

White Balance

While shooting, colour temperature is adjusted to match the light source so that the subject appears to have the correct colour.

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Samsung GX-20 Exif Exchangable Image File Format, Gradation, Histogram, Image Resolution, Image Quality, ISO Sensitivity

GX-20 specifications

The Samsung GX-20 is a notable digital single-lens reflex (DSLR) camera that debuted in 2007, capturing the interest of photography enthusiasts and professionals alike. As part of Samsung's foray into the DSLR market, the GX-20 offers a range of features and technologies designed to enhance the photography experience.

At the core of the GX-20 lies its 14.6-megapixel APS-C size CCD sensor, which provides high-resolution images with excellent detail and clarity. This sensor allows for a wide ISO range, from 100 to 6400, giving photographers the flexibility to capture images in various lighting conditions without sacrificing image quality.

One of the standout features of the GX-20 is its dual image stabilization system, which employs both sensor-shift technology and optical lens stabilization. This combination helps reduce the impact of camera shake, allowing for sharper images, especially in low-light environments or when using telephoto lenses.

The camera's design is both ergonomic and sturdy, featuring a weather-sealed body that ensures durability when shooting in challenging weather conditions. The 2.7-inch LCD screen provides a clear view for composing shots and reviewing images, and it incorporates live view functionality, enabling users to shoot from different angles easily.

In terms of autofocus, the GX-20 is equipped with a 11-point autofocus system, which enhances focus accuracy and speed. Photographers can choose between multiple autofocus modes, including single-shot, continuous, and manual focus, providing flexibility for various shooting scenarios.

Additionally, the GX-20 supports a range of advanced shooting modes, including face detection, scene modes, and exposure bracketing, allowing users to easily adapt to different photography styles. The camera also incorporates an in-camera RAW processing feature, enabling photographers to edit their images without the need for external software.

Connectivity options on the GX-20 include USB 2.0 for data transfer and support for SD/SDHC memory cards for storage. With an average battery life of approximately 600 shots, users can confidently shoot without the constant worry of running out of power.

Overall, the Samsung GX-20 represents a solid choice for both amateur and seasoned photographers. With its blend of high-resolution imaging, robust performance, and thoughtful design, it offers an appealing package that stands the test of time in the ever-evolving world of digital photography.