How to use the command 'ufraw-batch' (with examples)

ufraw-batch is a command-line utility used to convert RAW image files from digital cameras into standard image file formats such as JPEG or PNG. RAW files are unprocessed images captured by cameras, which contain more detail and dynamic range than processed image files. ufraw-batch allows users to easily convert these RAW files into more accessible formats while also providing options for resizing the images or extracting embedded previews. This makes it an essential tool for photographers who need to manage large volumes of RAW images efficiently without the need for interactive graphical software.

Use case 1: Simply convert RAW files to JPEG

Code:

ufraw-batch --out-type=jpg input_file(s)

Motivation:
Photographers often need to convert their RAW files into JPEG format for easier sharing and distribution. JPEG is a ubiquitous image format supported by virtually every device and software platform, making it ideal for sharing files over the internet or through email. This simple conversion process offers a balance between quality and size, maintaining sufficient image detail while reducing file size compared to standard RAW files.

Explanation:

• --out-type=jpg: This argument specifies that the output file type should be JPEG. It tells ufraw-batch to process the input RAW files and convert them into JPEG files.
• input_file(s): This represents the list of RAW files you want to convert into JPEG format. You can specify one or multiple input files.

Example output:
After running the command, the specified RAW files are converted into JPEG files in the same directory. For instance, image1.cr2 becomes image1.jpg.

Use case 2: Simply convert RAW files to PNG

Code:

ufraw-batch --out-type=png input_file(s)

Motivation:
Converting RAW files to PNG is useful when you prioritize image quality and do not wish to lose any detail due to compression. PNG is a lossless format that retains maximum image quality, making it a good choice for archiving or professional use where every pixel counts.

Explanation:

• --out-type=png: This directive specifies that the output should be in PNG format, which is a lossless format.
• input_file(s): List the RAW files intended for conversion to PNG. You can mention individual files or a group of files.

Example output:
The output files will have the .png extension, such as converting photo.raw to photo.png.

Use case 3: Extract the preview image from the raw file

Code:

ufraw-batch --embedded-image input_file(s)

Motivation:
Extracting the embedded preview image from a RAW file is advantageous when a quick view or thumbnail is needed without processing the entire file. These previews are included in RAW files by most cameras and provide a quick way to assess images without going through the conversion process, which saves time and computing resources.

Explanation:

• --embedded-image: Instructs ufraw-batch to pull out the embedded preview image contained within the RAW files. This often results in a quick extraction of a smaller, JPEG-format image.
• input_file(s): This represents the RAW files from which you want to extract the embedded preview images.

Example output:
Running the command extracts preview images like thumb.jpg from each RAW file into the working directory.

Use case 4: Save the file with size up to the given maximums MAX1 and MAX2

Code:

ufraw-batch --size=MAX1,MAX2 input_file(s)

Motivation:
Reducing the size of image files can be necessary for web use, where faster loading times are crucial, or for fitting images into specific spaces in media or documentation. Setting maximum dimensions allows users to convert images while maintaining the aspect ratio, ensuring that the images are scaled but not distorted.

Explanation:

• --size=MAX1,MAX2: Specifies the maximum allowable width (MAX1) and height (MAX2) of the output image. The image will be resized to fit within these dimensions while preserving the aspect ratio.
• input_file(s): Files to be processed. Here, you specify which RAW files you wish to resize.

Example output:
Images are resized according to the given maximum dimensions, resulting in a collection of files like resized_image.jpg at, for instance, 800x600 pixels.

Conclusion:

The ufraw-batch command provides a versatile, non-interactive means of converting RAW images to widely-used formats, making it easier for photographers to manage, share, and store their image files. Each use case offers different functionalities catering to different needs, such as image format conversion, quick preview extraction, or resizing, thus offering a robust toolset for efficient image handling.