Lines Matching +full:default +full:- +full:brightness +full:- +full:level
1 .. SPDX-License-Identifier: GFDL-1.1-no-invariants-or-later
9 Devices typically have a number of user-settable controls such as
10 brightness, saturation and so on, which would be presented to the user
13 values, and the default value will vary from device to device. The
21 pre-defined control IDs have the prefix ``V4L2_CID_``, and are listed in
22 :ref:`control-id`. The ID is used when querying the attributes of a
27 the user is supposed to understand. When the purpose is non-intuitive
28 the driver writer should provide a user manual, a user interface plug-in
35 Different in the sense of other bounds, another default and current
57 .. _control-id:
69 Picture brightness, or more precisely, the black level.
104 Another name for brightness (not a synonym of
127 Whiteness for grey-scale devices. This is a synonym for
146 .. _v4l2-cid-hflip:
151 .. _v4l2-cid-vflip:
156 .. _v4l2-power-line-frequency:
200 .. _v4l2-colorfx:
209 .. flat-table::
210 :header-rows: 0
211 :stub-columns: 0
214 * - ``V4L2_COLORFX_NONE``
215 - Color effect is disabled.
216 * - ``V4L2_COLORFX_ANTIQUE``
217 - An aging (old photo) effect.
218 * - ``V4L2_COLORFX_ART_FREEZE``
219 - Frost color effect.
220 * - ``V4L2_COLORFX_AQUA``
221 - Water color, cool tone.
222 * - ``V4L2_COLORFX_BW``
223 - Black and white.
224 * - ``V4L2_COLORFX_EMBOSS``
225 - Emboss, the highlights and shadows replace light/dark boundaries
227 * - ``V4L2_COLORFX_GRASS_GREEN``
228 - Grass green.
229 * - ``V4L2_COLORFX_NEGATIVE``
230 - Negative.
231 * - ``V4L2_COLORFX_SEPIA``
232 - Sepia tone.
233 * - ``V4L2_COLORFX_SKETCH``
234 - Sketch.
235 * - ``V4L2_COLORFX_SKIN_WHITEN``
236 - Skin whiten.
237 * - ``V4L2_COLORFX_SKY_BLUE``
238 - Sky blue.
239 * - ``V4L2_COLORFX_SOLARIZATION``
240 - Solarization, the image is partially reversed in tone, only color
242 * - ``V4L2_COLORFX_SILHOUETTE``
243 - Silhouette (outline).
244 * - ``V4L2_COLORFX_VIVID``
245 - Vivid colors.
246 * - ``V4L2_COLORFX_SET_CBCR``
247 - The Cb and Cr chroma components are replaced by fixed coefficients
249 * - ``V4L2_COLORFX_SET_RGB``
250 - The RGB components are replaced by the fixed RGB components determined
268 Enable Automatic Brightness.
281 value is interpreted as bits 0-7 Red color information, bits 8-15
282 Green color information, bits 16-23 Blue color information and bits
283 24-31 must be zero.
290 This is a read-only control that can be read by the application and
296 This is a read-only control that can be read by the application and
301 .. _v4l2-alpha-component:
305 queue of a mem-to-mem device) produces a frame format that includes
307 :ref:`packed RGB image formats <pixfmt-rgb>`) and the alpha value
308 is not defined by the device or the mem-to-mem input data this
310 When an output device (or output queue of a mem-to-mem device)
340 .. code-block:: c
382 .. code-block:: c
407 .. code-block:: c
455 .. code-block:: c
463 if (-1 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
477 if (-1 == ioctl(fd, VIDIOC_S_CTRL, &control)) {
491 if (-1 == ioctl(fd, VIDIOC_S_CTRL, &control)