Version 1.23.0, 6/23/2019
	Interpolation algorithm: Lanczos4
	Color: Bilateral filter improved with fast mode added
	Color: Morphology improved with kernel shape options added

Version 1.22.0, 5/26/2019
	Color: Bilateral filter pen
	Color: Morphology
	Color: Histogram dialog updated with mouse support

Version 1.21.1, 4/6/2019
	PPM/PGM/PBM: optimized decoding.

Version 1.21.0, 4/5/2019
	PPM/PGM/PBM file formats supported.

Version 1.20.0, 3/3/2019
	Color: Bilateral filter
	Updated mosaic/focus/blur/color/brightness pen: if you cancel the pop-up dialog when entering the tool, you exit the tool.

Version 1.19.3, 2/10/2019
	Color: Initial parameter of Black & white updated.
	Color: Apply tool editings by default when switching to other tools.

Version 1.19.2, 2/4/2019
	File name sorting algorithm updated.

Version 1.19.1, 1/12/2019
	PNG:  fixed bug when decoding 16-bit RGB & RGBA PNG files.

Version 1.19.0, 12/30/2018
	View: Next directory
	View: Previous directory
	Color: Black and white (adaptive)

Version 1.18.0, 11/4/2018
	Color: 32-bit RGBA -> RGB channel
	Color: 32-bit RGBA -> Alpha channel
	Color: Apply alpha channel
	Size: Expand
	Size: Tile
	Size: Insert grid
	Draw: added some new shapes, updated the arrow shape.

Version 1.17.0, 10/2/2018
	Erase: Erase by mask shapes.
	Restore: Restore by mask shapes.

Version 1.16.0, 10/1/2018
	Crop: Crop by mask shape.
	Crop by free selection: undo.
	Crp by shape: undo, set shape angle, size, center point.

Version 1.15.0, 9/2/2018
	Crop: Crop by mask pen.
	Erase: Erase by mask pen.
	Restore: Restore by mask pen.

Version 1.14.0, 8/24/2018
	Create Collage in two steps:
		1. File > New collage...
		2. Add > Collage image...

Version 1.13.0, 8/18/2018
	Color: Blur.
	Add: Grid.
	Replace: added support for RGB to replace RGBA regions, besides RGB to replace RGB and RGBA to replace RGBA.
	Draw Line/Arrow: set center point, set angle, set two points were added to popup menu.
	New 32-bit RGBA image: set alpha = 0 as default.
	File Save: Pormpt user to confirm before overwriting DualPhoto files.

Version 1.12.1, 8/11/2018
	WebP: fixed bug.

Version 1.12.0, 8/1/2018
	WebP supported.

Version 1.11.1, 7/26/2018
	Color Sharpen, Dithering, Emboss: 32-bit RGBA supported.

Version 1.11.0, 7/7/2018
	Undo: improved.
	Text: set center point.
	File Save: prompt user to confirm when overwriting multi-frame TIFF files.

Version 1.10.1, 6/23/2018
	Status bar text made more compact.

Version 1.10.0, 6/9/2018
	Add: Text circle
	Shape dialog: close dialog automatically when shape is selected.

Version 1.9.0, 5/27/2018
	32-bit RGBA -> 24-bit RGB: improved.
	File saved as TIFF: if TIFF settings dialog is canceled, save is canceled too.
	32-bit RGBA saved as BMP/JPEG/EJPG file: set fill color dialog.
	Add image: set center point.
	Draw shapes: set center point.
	File Open/New: if previous image has been modified, prompt the user to save image before opening/creating new image.

Version 1.8.0, 5/20/2018
	Batch: Add image.

Version 1.7.0, 5/13/2018
	Batch: Crop.

Version 1.6.1, 5/6/2018
	Batch rotate and flip: fixed bug.

Version 1.6.0, 5/5/2018
	Batch: Rotate and flip.
	Add text/image: improved quality of merged image when the added image or text is scaled down significantly.

Version 1.5.1, 4/30/2018
	Fixed crash when saving files, introduced in version 1.5.0.

Version 1.5.0, 4/30/2018
	Batch: Resize.

Version 1.4.1, 4/22/2018
	Fixed bug: 32-bit png save as bmp fails.

Version 1.4.0, 4/22/2018
	Batch: Format conversion.
	Add Image: JPEG/TIFF orientation supported.
	Replace: JPEG/TIFF orientation supported.

Version 1.3.5, 4/7/2018
	Resize: algorithm options.

Version 1.3.4, 4/5/2018
	Frame: updated user interface.

Version 1.3.3, 4/1/2018
	Draw: updated user interface.
	Optimized for very large image files.

Version 1.3.2, 3/17/2018
	Add text/image: improved quality of merged image in some cases.

Version 1.3.1, 3/4/2018
	Fixed bug: add text, move text outside image, undo, text rectangle does not disappear.

Version 1.3.0, 2/14/2018
	Added Restore: Restore by pen, Restore by shapes.

Version 1.2.2, 2/10/2018
	Updated RGBA -> RGB: If the choose color dialog is canceled, conversion is canceled.

Version 1.2.1, 2/4/2018
	Fixed a bug of Cut/Copy/Paste (maintain transparency).

Version 1.2.0, 2/3/2018
	Added to "Edit" and the "Select" tool: Cut (maintain transparency), Copy (maintain transparency), Paste (maintain transparency).

Version 1.1.0, 1/13/2018
	Added: Erase small regions automatically
	Added menu items to "Edit": OK, Cancel

Version 1.0.1, 1/1/2018
	Modified zoom in/out logic when the cursor is outside image.
	Erase by shape: show shape rect when drawing shape.
	Update image point and color when editing image.

Version 1.0.0, 12/17/2017
	Initial version.