# Fetch/convert files (dialog)

The “Fetch/convert files” dialog is used to make a copy of the source files. At first look, this step might seem to be redundant, but it allows an user to start again with a fresh copy whenever one makes a mistake during the calibration of the source frames.

## Activating the dialog

The dialog can be activated:

1. from the main menu: Reduce ‣ Fetch/convert files.

2. from the main toolbar:

## Copying the source files

The dialog for making a working copy of source files.

(1) You can either make a fresh copy of all source files in the project or make a copy of the files that are currently selected in the table of input files.

(2) When you process DSLR images, select a transformation for RAW images to gray scale. This option is ignored if the source frames are already in gray scale.

- Grayscale - the program sums all four pixels in Bayer mask. The resulting image have half the resolution of the RAW image and its range is four times higher than the range of the original picture.

- Red / blue - the program takes only red and blue pixels respectively. The resulting image have half the resolution of the RAW image and its range is the same as the range of the original picture.

- Green - the program takes only two green pixels on diagonal, sums them and the result divides by two. The resulting image have half the resolution of the RAW image and its range is the same as the range of the original picture.

To start the action, click the “Execute” button (3).

See also

Main window, Express reduction (dialog)