https://www.nichi-doku.de/en/werkstatt/Recent content in Workshop on 庭 — a journalHugoen-USSun, 25 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/bme680-raumklima/Sun, 25 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/bme680-raumklima/<p>A BME680 on an ESP32 measures temperature, humidity and air pressure – and also notices how stale the air in the room is. Bosch&rsquo;s BSEC2 library turns this into an air quality index that Home Assistant can use to remind you to ventilate. The build takes an hour; after that, the sensor needs one to two days to get to know its room.</p>https://www.nichi-doku.de/en/werkstatt/backgroundneutralization/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/backgroundneutralization/<p>BackgroundNeutralization adjusts the colour channels so that the background of a colour image becomes neutral (R ≈ G ≈ B). Unlike a colour calibration, it does not set a white balance for the object.</p>https://www.nichi-doku.de/en/werkstatt/blurxterminator/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/blurxterminator/<p>BlurXTerminator (BXT) is a deconvolution: it estimates how optics, seeing and tracking blurred the image and computes that blur out. Star shapes are corrected, stars become more compact and nebula structures sharper.</p>https://www.nichi-doku.de/en/werkstatt/curvestransformation/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/curvestransformation/<p>CurvesTransformation maps every input value to an output value along a curve. This allows contrast, saturation and hue to be changed in specific tonal ranges while other ranges stay untouched.</p>https://www.nichi-doku.de/en/werkstatt/ghs/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/ghs/<p>GeneralizedHyperbolicStretch (GHS) turns linear data into a visible image. Unlike a fixed curve, GHS lets you decide around which brightness value contrast grows most, and limits the stretch below and above it.</p>https://www.nichi-doku.de/en/werkstatt/gradientcorrection/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/gradientcorrection/<p>GradientCorrection (GC) builds a smooth model of the background gradient and subtracts it from the linear image. Structure protection prevents nebula structures from being treated as gradient.</p>https://www.nichi-doku.de/en/werkstatt/halrgb/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/halrgb/<p>Processing L, R, G, B and Ha exposures from a monochrome camera, from stacking to export. Ha strengthens the nebula in the red channel and in the luminance without distorting colours; RGB provides natural colours and star colours.</p>https://www.nichi-doku.de/en/werkstatt/localhistogramequalization/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/localhistogramequalization/<p>LocalHistogramEqualization (LHE) spreads the brightness values of each pixel&rsquo;s surroundings. Structures that differ only slightly from their immediate neighbourhood stand out – even when they lie in the same midtones as the rest of the image.</p>https://www.nichi-doku.de/en/werkstatt/lrgbcombination/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/lrgbcombination/<p>LRGBCombination combines a separate luminance with a colour image. The luminance provides brightness, structure and sharpness, the colour image provides colour. For the result to look neither pale nor oversaturated, the brightness of both images must match.</p>https://www.nichi-doku.de/en/werkstatt/luminanz-level/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/luminanz-level/<p>Before a separate luminance is combined with a colour image, the brightness of both must match. The procedure measures at fixed spots, evaluates the pattern of deviations and adjusts the luminance with a curve.</p>https://www.nichi-doku.de/en/werkstatt/morphologicaltransformation/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/morphologicaltransformation/<p>MorphologicalTransformation changes structures by their shape. In astrophotography it is used mainly for <strong>star reduction</strong>: stars shrink from the outside and stay round.</p>https://www.nichi-doku.de/en/werkstatt/multiscalegradientcorrection/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/multiscalegradientcorrection/<p>MultiscaleGradientCorrection (MGC) compares the image with a reference map of the sky (MARS). Structures smaller than a selectable scale are taken from your own image, larger ones are matched to the reference.</p>https://www.nichi-doku.de/en/werkstatt/schmalband/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/schmalband/<p>Processing narrowband data from a monochrome camera – Ha and OIII for HOO, plus SII for SHO – from stacking to export. The stars come either from the narrowband image or from short RGB exposures.</p>https://www.nichi-doku.de/en/werkstatt/noisexterminator/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/noisexterminator/<p>NoiseXTerminator (NXT) removes noise and, if desired, separates fine-scale from large-scale noise as well as brightness noise from colour noise. The defaults are usually too strong for astro images.</p>https://www.nichi-doku.de/en/werkstatt/osc-quadband/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/osc-quadband/<p>Processing exposures from a colour camera (OSC) with a quad band-pass filter such as the Optolong L-QEF – from stacking to export. The result is a near-natural RGB image with emphasised emission lines, not a narrowband image.</p>https://www.nichi-doku.de/en/werkstatt/pixelmath/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/pixelmath/<p>PixelMath applies a formula to every pixel. Images are referenced by their IDs. This lets you combine channels into colour images, blend images or recombine stars with a screen blend.</p>https://www.nichi-doku.de/en/werkstatt/rangeselection/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/rangeselection/<p>RangeSelection creates a mask (a &ldquo;range mask&rdquo;) that selects a brightness range. This limits a global process – such as a curve – to the nebula while protecting the background, or the other way round.</p>https://www.nichi-doku.de/en/werkstatt/scnr/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/scnr/<p>SCNR (Subtractive Chromatic Noise Reduction) limits one colour channel, usually green, to the level of the other two. This corrects greenish colour errors – but can also distort real signal if the object actually contains green components.</p>https://www.nichi-doku.de/en/werkstatt/spcc/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/spcc/<p>SpectrophotometricColorCalibration (SPCC) uses Gaia spectra to compute how each star should appear through the filters and sensor used, compares this with the image and derives the channel factors from it. It also neutralises the background.</p>https://www.nichi-doku.de/en/werkstatt/starxterminator/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/starxterminator/<p>StarXTerminator (SXT) removes the stars from an image and, if requested, also delivers an image containing only the stars. Nebula and stars can then be processed with the tools that suit each and recombined afterwards.</p>https://www.nichi-doku.de/en/werkstatt/synthetische-luminanz/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/synthetische-luminanz/<p>A synthetic luminance is built from existing channels instead of being captured with an L filter. It carries structure and sharpness; the colour image carries colour. Both are processed separately and merged with <span class="werkzeug"><button type="button" class="werkzeug-name" aria-expanded="false">LRGBCombination</button><span class="werkzeug-pop" role="note" hidden><span class="werkzeug-kurz">Replaces the brightness of a colour image with a separate luminance – structure and sharpness from the luminance, colour from the colour image.</span> <a href="https://www.nichi-doku.de/en/werkstatt/lrgbcombination/">Open fundamentals →</a></span></span>.</p>https://www.nichi-doku.de/en/werkstatt/wbpp/Fri, 16 Oct 2026 00:00:00 +0000https://www.nichi-doku.de/en/werkstatt/wbpp/<p>WeightedBatchPreprocessing (WBPP) is the script that turns lights, darks, flats and bias frames into calibrated, registered and integrated master lights. It groups the data automatically by filter, exposure and binning.</p>