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Formato del sensor de imagen. Comparación de diversos tamaños de sensores de imagen.

Formato del sensor de imagen

En fotografía digital, el formato del sensor de imagen es la forma y el tamaño del sensor de imagen. Los objetivos producidos para las cámaras de película de 35 mm se pueden montar bien en los cuerpos de las cámaras digitales, pero el círculo de imagen del objetivo del sistema de 35 mm es más grande que lo requerido por el sensor, e introduce luz indeseada en el cuerpo de la cámara.

Por otro lado, el menor tamaño del sensor de imagen -comparado a los del formato de 35 mm-, resulta en el recorte de la imagen. Crop factor. The outer, red box displays what a 24×36 mm sensor would see, the inner, blue box displays what a 15×23 mm sensor would see.

Crop factor

(The actual image circle of most lenses designed for 35 mm SLR format would extend further beyond the red box than shown in the above image.) In digital photography, a crop factor is related to the ratio of the dimensions of a camera's imaging area compared to a reference format; most often, this term is applied to digital cameras, relative to 35 mm film format as a reference. In the case of digital cameras, the imaging device would be a digital sensor. The most commonly used definition of crop factor is the ratio of a 35 mm frame's diagonal (43.3 mm) to the diagonal of the image sensor in question; that is, CF=diag35mm / diagsensor. Given the same 3:2 aspect ratio as 35mm's 36mm x 24mm area, this is equivalent to the ratio of heights or ratio of widths; the ratio of sensor areas is the square of the crop factor. Introduction[edit] Digital lenses[edit] See also[edit]

Learn about RAW, JPEG, and TIFF with the digital photography experts at There seems to be a lot of confusion among some new digital camera owners about exactly what the difference is between RAW, JPEG and TIFF files.

Learn about RAW, JPEG, and TIFF with the digital photography experts at

This article is intended to be a very basic guide to these file types and how they are related in a typical digital camera. First some basics The digital sensor in the majority of digital cameras is what is known as a BAYER PATTERN sensor. This relates to the arrangement of red, green and blue sensitive areas. A typical sensor looks like this: Each pixel in the sensor responds to either red, green or blue light and there are 2 green sensitive pixels for each red and blue pixel. A conventional digital image has pixels which can be red, green, blue of any one of millions of other colors, so to generate such an image from the data output by the sensor, a significant amount of signal processing is required. RAW data Now one of two things can be done with the RAW data. RAW to JPEG or TIFF conversion When to shoot RAW, when to shoot JPEG? Camera raw, DNG : Digital Negative (DNG) Raw file formats are extremely popular in digital photography workflows because they offer creative professionals greater creative control.

Camera raw, DNG : Digital Negative (DNG)

However, cameras can use many different raw formats — the specifications for which are not publicly available — which means that not every raw file can be read by a variety of software applications. As a result, the use of these proprietary raw files as a long-term archival solution carries risk, and sharing these files across complex workflows is even more challenging. The solution to this is Digital Negative (DNG), a publicly available archival format for the raw files generated by digital cameras. By addressing the lack of an open standard for the raw files created by individual camera models, DNG helps ensure that photographers will be able to access their files in the future. Hundreds of software manufacturers such as Apple and Google have developed support for DNG.

Steve on Image Processing » Tips for reading a camera raw file into MATLAB » Tips for reading a camera raw file into MATLAB. An academic colleague asked me recently how to read the sensor data (in Bayer or color filter array form) from a Nikon raw camera file (an NEF file) into MATLAB.

Steve on Image Processing » Tips for reading a camera raw file into MATLAB » Tips for reading a camera raw file into MATLAB

We figured out a way to do it, and I thought I'd pass it along. I should caution you, though, that there are multiple steps involved, some of which are "advanced maneuvers. " First, I suggested that we try using the free Adobe DNG Converter program to convert the NEF file to a DNG (Digital Negative) file. After some trial-and-error we found that it's necessary to tell DNG Converter to do the conversion "uncompressed. " Here are some screenshots of the relevant dialogs. Under the covers, a DNG file is a very specialized kind of TIFF file. But first let's poke at a sample DNG file using imfinfo. info = imfinfo('books.dng') You can see that imfinfo thinks that this file is a 256-by-170 truecolor image.

Info.SubIFDs{1} That's the good stuff! Here's a screen shot of imtool showing the resulting color filter array at 400% magnification.