doc: update some docs

doc/howto/colour-display/readme.md

@@ -46,8 +46,6 @@ shaper curve.
 
 ## gui
 all gui colours need to be given in rec2020 tristimulus values.
-`gui/render.cc` has a function to convert user/theme supplied
-srgb values to linear rec2020.
 
 ## thumbnails
 bc1 thumbnails are stored in gamma/sRGB. they are loaded as
@@ -66,6 +64,6 @@ will be rendered at that precision (all our internal buffers
 have higher precision).
 
 ## cli
-the command line interface explicitly inserts `f2srgb` nodes before
+the command line interface explicitly inserts `colenc` nodes before
 the `o-*` nodes if the output format requires gamma encoding,
 such as jpeg.

src/pipe/modules/colenc/readme.md

@@ -16,6 +16,12 @@ possible choices for the trc are: `linear`, `709` (SMPTE RP 431-2),
 `sRGB` (IEC 61966-2-1), `PQ` (SMPTE ST 2084), `DCI` (SMPTE ST 428-1),
 `HLG` (Rec. ITU-R BT.2100-1), and `gamma`.
 
+if you are looking for the reverse operation, colour decoding, the [`colour`
+module](../colour/readme.md) is probably what you need. it will pick up the
+primaries and trc from metadata that travels with the buffers.
+some input modules such as the [`i-exr` module](../i-exr/readme.md) allow you
+to overwrite these annotations.
+
 ## connectors
 
 * `input` scene referred linear rec2020

src/pipe/modules/i-pfm/readme.md

@@ -7,6 +7,8 @@ point maps. does not flip y coordinate.
 
 * `filename` the name of the input file, potentially containing %04d for sequences
 * `startid` the index of the first file if loading a sequence
+* `noise a` the gaussian part of the noise estimation
+* `noise b` the poissonian part of the noise estimation
 
 ## connectors
 

src/pipe/modules/readme.md

@@ -17,6 +17,7 @@ also see the [list of presets shipped with vkdt](../../../doc/howto/presets/pres
 * [i-lut: half float lut input module](./i-lut/readme.md)
 * [i-mcraw: read motioncam raw video](./i-mcraw/readme.md)
 * [i-mlv: magic lantern raw video input module](./i-mlv/readme.md)
+* [i-obj: load triangle meshes from wavefront obj files](./i-obj/readme.md)
 * [i-pfm: 32-bit floating point map input module](./i-pfm/readme.md)
 * [i-raw: input module for raw-format photographic stills or timelapses](./i-raw/readme.md)
 * [i-v4l2: webcam input module](./i-v4l2/readme.md)
@@ -57,6 +58,7 @@ also see the [list of presets shipped with vkdt](../../../doc/howto/presets/pres
 
 **colour processing**
 
+* [colenc: encode colour for colour managed output like adobeRGB, P3, etc](./colenc/readme.md)
 * [colour: generic colour manipulation/input transform](./colour/readme.md)
 * [grade: simple ACES CDL grading tool](./grade/readme.md)
 
@@ -101,7 +103,6 @@ also see the [list of presets shipped with vkdt](../../../doc/howto/presets/pres
 * [align: align animation frames or burst photographs](./align/readme.md)
 * [blend: masked frame blending](./blend/readme.md)
 * [cnngenin: generate random input for neural network training](./cnngenin/readme.md)
-* [colenc: encode colour for colour managed output like adobeRGB, P3, etc](./colenc/readme.md)
 * [format: change texture format (number of channels and data type)](./format/readme.md)
 * [f2srgb: convert linear floating point data to 8-bit sRGB for output](./f2srgb/readme.md)
 * [kpn-t: kernel prediction neural network for denoising, training](./kpn-t/readme.md)
@@ -114,7 +115,6 @@ also see the [list of presets shipped with vkdt](../../../doc/howto/presets/pres
 
 * [accum: accumulate frames in a frame buffer](./accum/readme.md)
 * [bvh: append triangle mesh to ray tracing acceleration structure](./bvh/readme.md)
-* [i-obj: load triangle meshes from wavefront obj files](./i-obj/readme.md)
 * [logo: render the animated vkdt icon](./logo/readme.md)
 * [quake: the 1996 game ray traced based on QSS](./quake/readme.md)
 * [rt: real-time ray tracing](./rt/readme.md)