Save/Export

Quant4D allows the user to save and export data in various formats. The Save/ Export dialog can be accessed by clicking the icon in the main UI, pressing ctrl+s at any point, or selecting “Export > Save as” on the left hand side of the toolbar in any image window, .

Save Images

In the Save Images tab, the user may set a Filename Prefix that will be prepended to all saved images. Additionally, tick boxes are provided to include the inner and/or outer annular detector angles in the filename. A list of available images is shown where the user can select one or more images.

Tip: To select specific images, hold down the control key (ctrl) while clicking the desired images. To select a range of images, hold the shift key and click the first and last image in the range.

Data formats

After selecting the desired images, the user can choose the format in which the images are saved. By default, both options are selected, but the user can select one or both independently.

Raw data

When the Raw data option is selected, data are saved as TIFF files at the resolution of the original 4D-STEM dataset with raw intensity values directly from the data as processed in the UI. This format is most useful for direct quantitative analysis of the data, as it preserves the original pixel density and counts scale.

Annotated display quality data

When the As-displayed option is selected, data are saved as PNG files at the desired resolution set by the user in the DPI field. Additionally, the user can choose to include any annotations such as detectors, ROIs, axis labels, etc. This format is most useful for presentation, publication, and later reference as it provides a clear visualization of detectors and ROIs used to generate the images, and can be saved at artificially higher resolution than the original data.

Export Dataset

In the Export Dataset tab, the user is able to export the dataset to either .h5 or .raw binary format. This can be helpful when the original data is in a proprietary format or is part of a larger dataset. The user can also select the endianness of the data to export, though Little Endian is generally recommended as it is the most common memory ordering.

If the user would like to reduce the size of the dataset, there are options to export ROIs in both diffraction- and/or real-space, as well as to bin diffraction patterns or subsample real-space. When the user selects either of these options, a yellow rectangular ROI will appear on the respective image window.