target level (automatic mode) Define the target level for automatic exposure correction (EV) relative to the white point of the camera. A percentile of 50% denotes a position in the histogram where 50% of pixel values are above and 50% of pixel values are below that exposure. percentile (automatic mode) Define a location in the histogram to use for automatic exposure correction. Use the color picker to sample a portion of the image to be used for this calcuation. clipping threshold (manual mode) Define what percentage of bright values are to be clipped in the calculation of the exposure and black level correction. The color picker tool on the right sets the exposure such that the average of the selected region matches the target lightness defined in spot exposure mapping options. To adjust by more than the default limits shown on the slider, right click and enter the desired value up to +/-18 EV (see module controls). exposure (manual mode) Increase (move to the right) or decrease (move to the left) the exposure value (EV). compensate camera exposure (manual mode) Automatically remove the camera exposure bias (taken from the image’s Exif data). □module controls mode Choose the mode of operation (automatic/manual). A typical use case of automatic mode is deflickering of time-lapse photographs. This mode is particularly useful for automatically altering a large number of images to have the same exposure. Darktable automatically selects the exposure compensation that is required to shift the selected percentile to the selected target level (see definitions below). This module has two modes of operation: manual Set the exposure, black level and clipping threshold manually automatic (RAW images only) Use an analysis of the image’s histogram to automatically set the exposure. Increase or decrease the overall brightness of an image.
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