laheller / fplibraw

FreePascal wrapper around Libraw

FPLibRaw

FreePascal wrapper around Libraw. It was written using Lazarus IDE powered by FreePascal. Wrapper unit libraw.pas includes pascal signatures for all external native methods from libraw.dll.

Try the demo console application demo.pas which demonstrates key libraw features, like:

• initialize library
• open raw file
• export raw file to TIFF
• export thumbnail from raw file to JPEG
• load raw data, process it and export to Windows bitmap
• error handling

Demo project

To successfully build wrapper and demo application the following steps are needed:

• Download and install latest 64bit version of Lazarus IDE (also installs FreePascal).
• Open demo.lpi project file in Lazarus (Ctrl+F11) and build (Shift+F9).
• The built executable demo.exe requires to have the included libraw.dll library in the same folder!
• Note: 64bit build of the project is required, since the included libraw.dll is also a 64bit library!

Sample usage of wrapper

program Sample;
uses Crt, Libraw;
var
	handler: Pointer;
	err: LibRaw_errors;
begin
	handler := libraw_init(LibRaw_init_flags.LIBRAW_OPTIONS_NONE);
	libraw_set_output_tif(handler, LibRaw_output_formats.TIFF);
	libraw_set_no_auto_bright(handler, 0);
	err := libraw_open_file(handler, 'C:\Temp\RawImage01.CR2');
	if (err <> LibRaw_errors.LIBRAW_SUCCESS) then begin
		WriteLn('Open:            ' + libraw_strerror(err));
		libraw_close(handler);
		Write('Press any key...');
		ReadKey;
		Exit;
	end;
	err := libraw_unpack(handler);
	libraw_dcraw_process(handler);
	libraw_dcraw_ppm_tiff_writer(handler, 'C:\Temp\ProcessedImage01.tiff');
	libraw_close(handler);
end.

fplibraw's Issues

Doesn't seem to work for CR3

Thanks for this very useful code. I intend to use it for my application.

It works for CR2 files but it doesn't work for me for CR3 files. It seems to works but no files are produced. The original LibRaw program unprocessed_raw.exe works with the same CR3 files.

I download the CR3 raw files form
https://drive.google.com/drive/folders/1-ZoYTZlIOqkNJSXUrGPES_OWEBinD_cq

Han

Sample for creating unprocessed 16 bit PGM files.

Would it be possible to add sample code to create 16 bit PGM files like "unprocessed_raw"?

Cross-platform

Are there possibilities to adapt the Libraw DLL code to Linux, Mac and Raspberry-Pi arm processor?

Han