lore_sga ha scritto:
mi pare di capire che, vista la luna e la modifica del sensore, tutto quel chiarore è normale! non ci ero per niente abituato.
a questo punto come procedete in genere? date i raw in pasto ad un programma di somma tipo dss o correggete prima il fondo cielo e poi sommate i file?
grazie ancora
Lorenzo
Io utilizzo DSS, ed i file Raw vengono dati in pasto al programma che ne effettua allineamento e calibrazione; nell'opzione settaggi Raw/DDP seleziono entrambe le voci relative al bilanciamento del bianco (Automatico, interno alla macchina); dopo la calibrazione, seguono le altre fasi del processing dell'immagine... Nel sito di Renzo c'è un tutorial relativo a DSS,ed anche nel Blog di Pedro2005....
Però, aggiungo che prima di utilizzare DSS, analizzo le immagini in Raw con Digital Photo Professional (in dotazione alla Canon) per scartare eventualmente le pose mosse e venute male..
infine: questa è una lista delle operazioni raccomandate per il processing di una immagine astronomica (è l'help file di MaxIm DL):
Recommended Processing Sequence
What is the best order to apply the processing functions in? There is no single way to do things, but generally speaking the sequence below is recommended. Omit steps 2 and 7 when imaging with monochrome cameras such as certain Lumenera models and some webcams.
1. Image calibration
2. Color conversion for "one-shot" color cameras, such as DSLRs
3. Bad pixel removal (or hot pixel/dead pixel kernel filter)
4. Make pixels square (for cameras with non 1:1 pixel aspect ratios)
5. Image stacking (with alignment if required)
6. Filtering (DDP, unsharp mask, low-pass)
7. Color combine when using monochrome cameras with color filters such as the Meade DSI Pro
8. Color adjustment
9. Additional filtering such as range-restricted sharpening and smoothing
10. Stretching (Curves, gamma stretch, etc.)
Generally speaking, image calibration should always be done first. Color conversion ("debayer"), when applicable, must be done next because all other processing steps corrupt the encoded color information.
Spatial filtering (Step 5) can alter the color representation of an image. To avoid this, it is possible to use Convert to Mono and Split Tricolor to create separate Luminance, R, G, and B images. Then filter only the Luminance frame and recombine using LRGB. DDP in particular is best done in this way, because it will tend to reduce color saturation (although this can be compensated for using the Color Saturation command).
There is a great deal of flexibility in the latter steps. Generally speaking it is better to perform linear filters on images before they are stretched in a non-linear fashion, but there may be reasons to change the order of the steps.
A common technique for the final stretching is to gradually boost the mid-range by repeatedly using the Curves command. Another useful technique is to smooth the darker parts of the image while sharpening the brighter parts. The various filter commands have this capability built-in.
The most important rule to remember is: experiment!
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