Concepts and Abbreviations in the HDR-Photography
HDR: Stands for High Dynamic Range and describes a method, in which different exposures are compiled into a 32-bit database, which is then reduced to a 16- or 8-bit image through the utilization of tone mapping. HDR is a distinct technique, which requires a specialized software.
DRI: Stands for Dynamic Range Increase and describes a method of processing, which creates an image with higher contrasts from different exposures through layers and masks. Hereby, 32-bit files are produced. Often DRI is used as an umbrella term for the entire procedures and techniques used for the extension of the dynamic range.
Exposure Blending: Also, stands for the processing of different exposures with the objective that the processing retains details in depth and simultaneously not eroding the lights. This method can be automated with the aid of software or can be implemented with layers and masks, while retaining full control, however, being more time consuming.
LDRI: The Low Dynamic Range Image is the starting image for the HDR-processing. Usually, between three and nine different 8-bit exposures (LDRI) are compiled into a 32-bit image. Depending upon the range of contrasts to be covered, there can be considerably many more exposures.
HDRI: This describes the actual 32-bit High Dynamic Range Image. Erroneously, often the tone mapped image, which is actually the LDRI compiled through tone mapping to a 8- or 16-bit image, is called HDRI.
Tone Mapping: The 32-bit extensive dynamic range of the HDRI must be transformed into the color range - 8 or 16 bit - of the standard display hardware. This technique is called tone mapping. Depending upon the procedure and type of application being used, the Tone Mapping can enhance or reduce the HDR-effect.
Pseudo-HDR: As an alternative to the exposure series, an image can be generated with the so-called Pseudo-HDR. For this, a digital photograph should be available as a RAW-file. With the aid of a RAW-software, corrections in exposures are applied upon the initial image and saved as copies of the RAW-file, in TIF- or JPEG-formats. These, in this manner, created "fake" different exposures are then transformed into a HDRI, with the aid of the HDR-software. The results are not as impressive as HDR-images compiled from separate actual photographs.
DRI: Stands for Dynamic Range Increase and describes a method of processing, which creates an image with higher contrasts from different exposures through layers and masks. Hereby, 32-bit files are produced. Often DRI is used as an umbrella term for the entire procedures and techniques used for the extension of the dynamic range.
Exposure Blending: Also, stands for the processing of different exposures with the objective that the processing retains details in depth and simultaneously not eroding the lights. This method can be automated with the aid of software or can be implemented with layers and masks, while retaining full control, however, being more time consuming.
LDRI: The Low Dynamic Range Image is the starting image for the HDR-processing. Usually, between three and nine different 8-bit exposures (LDRI) are compiled into a 32-bit image. Depending upon the range of contrasts to be covered, there can be considerably many more exposures.
HDRI: This describes the actual 32-bit High Dynamic Range Image. Erroneously, often the tone mapped image, which is actually the LDRI compiled through tone mapping to a 8- or 16-bit image, is called HDRI.
Tone Mapping: The 32-bit extensive dynamic range of the HDRI must be transformed into the color range - 8 or 16 bit - of the standard display hardware. This technique is called tone mapping. Depending upon the procedure and type of application being used, the Tone Mapping can enhance or reduce the HDR-effect.
Pseudo-HDR: As an alternative to the exposure series, an image can be generated with the so-called Pseudo-HDR. For this, a digital photograph should be available as a RAW-file. With the aid of a RAW-software, corrections in exposures are applied upon the initial image and saved as copies of the RAW-file, in TIF- or JPEG-formats. These, in this manner, created "fake" different exposures are then transformed into a HDRI, with the aid of the HDR-software. The results are not as impressive as HDR-images compiled from separate actual photographs.
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