AJT - Jpegtran for Android

Summary

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Jpegtran is CUI tool developed by IJG(Independent JPEG Group).

This software is Jpegtran ported to Android.

Jpegtran can perform the following operations without quality loss.

- Rotation in 90 degree units (-rotate)

- Make grayscale image (Drop color components) (- grayscale)

- Flipping horizontal / verticval / XY axes (-flip, -transpose, -transverse)

- Cut out part of image (-crop)

- Partial fill of image (-wipe)

- Optimization of Huffman table (-optimize)

- Conversion to progressive JPEG (-progressive)

- Add restart marker (-restart)

How to use

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- Tap [Input]. Since the gallery opens, choose a JPEG image.

- Tap [Switch] to select the operation to be performed on the JPEG image.

- The output file name automatically generated and displayed to [Output].

If you want to change, tap [Output].

- Press the [Execute] button

- When OK is displayed in [Result], processing is finished.

By tapping [Result], you can check the result.

Crop and Wipe

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The area of Crop and Wipe can be specified while watching the image.

Choose [Switch] -> [Transform] -> [AreaSelector].

An image is displayed and a white line is displayed at the boundary.

Drag this white line and specify the area.

Image information can be displayed by long tapping.

Other operations

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Press Menu key, or press three dots on title bar, menu will be displayed.

- Input selector

You can choose to use the gallery to select images or use the built-in file selector.

- Default output

You can select how to automatically generate filenames.

File name appended with "_ajt" in the same directory.

Save to specified directory.

To long tap [Input], you can check the source JPEG image.

Example of operation

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Here is an example of the operation to cut out part of an image.

- Tap [Input] and select an image

- Choose [Switch] -> [Entropy coding] -> [-optimize]

You can reduce the file size with this operation.

- Select [Switch] -> [Transform] -> [TransformType] -> [Crop]

- Select [Switch] -> [Transform] -> [TransformType] -> [AareSelector]

As the image is displayed, drag the white frame to make the area of the image.

- Tap [Executte] to execute "Jpegtran"

- Tap [Result] and check the result image.

About this software

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This software is based on part on the work of the Independent JPEG Group.