Зачем конвертировать FIT в PNG?
FITS images store raw scientific pixel data (often 16-bit or 32-bit floating-point) that ordinary image viewers, browsers, and most photo editors cannot open. .png is a standard lossless format supported everywhere. The usual reason to convert is sharing astrophotography results online, embedding the image in a document, or passing it to a non-astronomy editor for further processing.
Способы конвертации FIT в PNG
SAOImageDS9 FREE
Open the .fit file via File > Open, adjust the stretch under Scale (Linear, Log, or Sqrt), then export via File > Export > PNG.
XnView MP FREE
Open the .fit file in XnView MP - it applies an automatic stretch on load - then use File > Save As and set the format to PNG.
Об этих форматах
.FIT
Flexible Image Transport System (FITS) image
Файл .fit - это астрономическое изображение в формате FITS (Flexible Image Transport System), стандартном научном формате данных, используемом телескопами, камерами для астрофотографии и…
Открыть детали .FIT →
.PNG
Portable Network Graphics
PNG (Portable Network Graphics) - это формат растровых изображений со сжатием без потерь. Любая современная ОС, браузер и графическое приложение открывают PNG нативно - достаточно двойного…
Открыть детали .PNG →Качество и на что обратить внимание
- The stretch is permanently baked into the PNG: FITS pixel values span a far wider range than PNG's 8 bits per channel can hold, so the visual compression is irreversible.
- FITS header metadata (exposure time, RA/Dec, WCS coordinates, filter, date) is not carried over to PNG; keep the original
.fitfile if you need that data. - PNG is suited for web sharing; if you plan further editing in Photoshop or GIMP, a 16-bit TIFF retains more dynamic range than an 8-bit PNG.
Часто задаваемые вопросы
Will the PNG look like what I see in my astronomy viewer?
Does PNG carry FITS coordinates or metadata?
Can I export a 16-bit PNG from a FITS file?
The `.fit` extension also appears on Garmin files - is that the same format?
.fit as well, but those files are completely unrelated and cannot be opened in an astronomy viewer.
