I don't think that's what the program is doing, unpacking the four and letting you use one of the files, I think it's actually making a bonafide squishyness four DNG into one DNG for the use of deriving the benefit of pixelshift. Happy Easter!Ah, but I think this program is squishing the four DNG images into one DNG rather than Tiff? That would be preferable in some instances for my PP workflow. You might also find that feeding the four unpacked DNGs in to some image stacking software can do a decent job of squishing although the results may not be quite as good as a dedicated squisher that knows what pixelshift is all about. That would let you pick which of the four images in a pixelshift set was the best one. I've never used PixelShift2DNG, but it looks like it is able to unpack the pixelshift DNG into four individual DNG files for follow-on processing. So if you want the added resolution and noise reduction of pixelshift, it has to first be processed by software that knows how to squish the four DNG images into one TIFF. Apparently, many image processing apps don't know how to handle this and only access the first of the four DNGs. Yes, the raw pixelshift image is a DNG, but the DNG "standard" is sufficiently complex that individual camera makers can easily create valid DNG files that other software makers' apps cannot properly handle or can't make best use of the data.Īs you mentioned, in the case of pixelshift DNG, the single DNG file actually contains four DNG images. So i'm just wondering if anyone is using this small program and if I am correct in saying that taking a native pixelshift DNG file to LR actually is pointless before taking the DNG file elsewhere first to 'squish' the 4 frames properly so that LR/PS can actually derive the benefit? My only gripe with RawTherapee is the type of Tiff it provides, it's not a particularly great one in a sense that I feel I need to do some exposure correction before saving and having it to further work on in LR, that and the fact that many of my presets and LUTs prefer a DNG vs a Tiff to work with. I really have limited experience in using Pixelshift in a more 'still life' situation where a trip to RawTherapee for motion correction is not required, but I thought taking the native pentax pixelshift DNG file to LR to work on worked anyway, but perhaps not? Would LR do its thing and just show only one of the 4 DNG frames and you're really only working and editing on that? Whereas at least with RawTherapee's process of ending with a Tiff you're actually deriving the benefits of the 4 frames (provided Motion Correction did not steal away too much information from the other frames)? I'm a little confused because a Pentax pixelshift image is already a DNG, mostly I take this shot to RawTherapee for some advanced Motion Correction before saving as a Tiff and then editing the Tiff file in LR. Using wrong maximum value in processing will result into false colored highlights: (sorry, it is in russian, but google translate will do the trick).So I was alerted to this little free program, I believe the intent is to assist cameras taking pixelshift shots (Pentax included) to being a 'proper' singe DNG file from which Raw Developers like Lightroom/Photoshop can properly handle and exploit the benefits. Some cameras may clip data below ADC maximum value to avoid ADC non-linearity (many Canon cameras). Some cameras may subtract 'black level' (bias) before raw values recording, thus resulting in lower maximum values.Ģc. Some cameras alter RAW data in some way (Sony lossy compression mentioned above and many other formats with highlights compression tone curve), so data range is not same as ADC rangeĢb. (You may also find RawDigger software very useable for your work, to see raw data 'as is')Ģ. Some cameras use full pixel capacity at base (lowest) ISO, so data maximum is lower.Īnd inspect Panasonic histograms at low iso In first assumption, you're right: there is ADC with fixed bit count, so data range should fit into this range.ġ.
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