brampf / fitskit

A native iOS library to compute vector / image data of FITS files

---

FitsRaw now on Testflight!

FitsRaw is a leightweight viewer app for your iPad to view files in the [FITS file format](https://fits.gsfc.nasa.gov) commonly used in Astrophotography. For more information about the FITS file format head over to [NASA](https://fits.gsfc.nasa.gov/fits_documentation.html) of have a look ad [Wikipedia](https://en.wikipedia.org/wiki/FITS)

FitsRaw is currently availabe on Testflight. In order to join, just click ot the following URL: https://testflight.apple.com/join/Hr2K1Wg8

• Open FITS files and renders an image for the data unit of the primary HDU as image data
• Auto-detection of Grayscale, RGB and RGGB image data (particularly for the ZWO ASI294MC camera)
• Display the content of the header unit for the currently selected HDU
• Preliminary rendering of tables (Bintable only only display the first value of an array)
• Placeholder for empty HDUs or Image HDUs with less than 1 or more than 3 dimensions
• Rendering of thumbnails for the data unit of the primary HDU of FITS files in the file browser
• Rendering of preview for the data unit of the primary HDU for apples quicklook

FITS Raw currently supports only iPad OS and is tested with a rather old & slow iPad 5 on iPad OS 14.5.

For the latest updates and your feedback please see Discussions

FITSCore	FITSKit

---

fitskit's Issues

Build question

FITSKit commit 187dc49 isn't building for me. The problem is at line 73 in AnyImageHDU
self.set(width: Int(buffer.width), height: Int(buffer.height), layers: 3, dataLayout: .UINT8, data: data)

Maybe the last FITSCore commit eliminated set() with the signature it wants?

Support for RGGB pixel format from an astrophotography camera (ASI, using a Sony color chip)

Next challenge ... My FITS images are in the RGGB pixel format from an astrophotography camera (ASI, using a Sony color chip).

1. I like to convert the FITS with either CoreImage or with CVPixelBufferCreate... to a raw image in order to apply all the nice RawFilters from iOS/Swift to them.

I'm completely stuck. I can create a pixel buffer with the kCVPixelFormaType_14Bayer_RGGB, but the quickview in XCode only shows me a grayscale image. I am not able to convert it to a CIImage or CGImage showing colors, it is either nil or remains a grayscale image that is not de-bayered / demosaiced.

2. Looking at your RGB conversion of the FITS (FITSBytesTool), I noticed the RGB are consecutively ordered (3x layersize). This is not the case for me, where I have a Bayer matrix. Re-writing this function to separate the pixel colors, does result in a color image, but the colors are all wrong...

Any hint to solve either problem would be highly appreciated.

Originally posted by @Planet30 in brampf/fitscore#8 (reply in thread)