Difference between revisions of "LazPaint"

Revision as of 01:32, 9 March 2013

LazPaint is an image editor, like PaintBrush or Paint.NET, written in Lazarus (Free Pascal). It uses the library BGRABitmap to draw.

The drawing takes into account the level of transparency (alpha channel), shape borders are rendered with antialiasing, and color composition includes gamma correction.

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How to use it

Useful keys

Maintaing Space key down switches temporarily in move mode
F6 key hides/show all tool windows
Ctrl key aligns to image pixels and limits possible angles with rotation tool
Backspace key erases last point in a polygon or last letter in a text
Enter key releases selection

Right mouse button can be used to:

Swap drawing colors temporarily
Subtract from selection (selection tool)
Define light position (shaded text, shaded shapes)
Finish a shape (polygon, curve)

Tutorials

Video tutorials are available on Youtube :

Download

Binaries can be downloaded on Sourceforge for Windows and Linux.

http://sourceforge.net/projects/lazpaint/files/bin/

You can also download the source code and compile it for a specific platform. MacOS version is a bit experimental, to compile it, it is necessary to remove the dependency to LNet package.

Screenshots

Interface

Many common actions can be done with the toolbar. Zoom can be changed with the magnifying glass (+ or -), or by clicking on the 1:1 button to show the image at its original size in pixels, or with the zoom fit button to set the zoom so that the whole image be within the window.

It is possible to undo/redo the 200 last operations. If you have a doubt on what you are drawing, undo back to the beginning, save a copy, and redo the modifications before going further.

Windows

The main window allows to draw, and there is also a color circle window and a toolbox. Use the color circle window to select a color, its luminosity and its opacity. The toolbox offers a wide range of drawing tools and selection tools.

Selection

Selection is composed with rectangles, ellipses and pen drawing. It contains levels of transparency, so that the border of an elliptic region has antialiasing. If you cut a hole in your bitmap, the border will be antialiased, and if you draw a gradient inside an elliptic selection, the border will be with antialiasing.

With the left button you can add elements to the selection, and with the right button, you can remove elements from it. The selection can be released with a button on the toolbox or by hitting Enter.

The rotation tool allows to rotate the current selection with a free angle.

The selection fit option reduces the selection to non transparent pixels.

Input file formats

Images can be loaded with the toolbar or with the File menu.

With layers :

LZP : LazPaint file format
ORA : OpenRaster exchange file format
PDN : Paint.NET images

Flat :

BMP : uncompressed bitmaps
GIF : user can choose a frame if animated
ICO : icon, user can choose a size
JPG : lossy compression
PCX : personal computer exchange
PNG : portable network graphic

Output formats

With layers :

LZP : LazPaint file format
ORA : OpenRaster exchange file format

Flat :

BMP : uncompressed bitmaps
JPG : lossy compression
PCX : personal computer exchange
PNG : portable network graphic
XPM : X pixmap

Image manipulation

An image can be resampled, flipped horizontally and vertically.

Smart zoom x3 : resize the image x3 and detects borders; this provides a useful zoom with ancient games sprites.

Color manipulation

Colorize : set the color of an image while preserving intensities
Shift colors : cycle colors and change colorness (saturation)
Intensity : make colors lighter or darker without making them white
Lightness : make colors lighter or darker by making them whiter
Normalize : use the whole range of each color channel and alpha channel
Negative : invert colors (with gamma correction)
Linear negative : invert colors (without gamma correction)
Grayscale : converts colors to grayscale with gamma correction

Filters

Filters can be applied to the whole image or to the active selection.

Radial blur : non directional blur
Motion blur : directional blur
Custom blur : blur according to a mask

Sharpen : makes contours more accute, complementary to Smooth
Smooth : softens whole image, complementary to Sharpen
Median : computes the median of colors around each pixel, which softens corners

Contour : draws contours on a white background (like a pencil drawing)
Emboss : draws contours with shadow

Sphere : spherical projection
Cylinder : cylinder projection
Clouds : add clouds of the current pen color

Command line

General use :

lazpaint inputfile [/command1 [/command2...]] [outputfile]

On Linux, the command prefix is '-'. on Windows, the command prefix can be '-' or '/'.

Line without command

You can omit commands to convert an image to another file format. For example :

lazpaint image.pdn image.png

will flatten and save a Paint.NET image into a PNG.

Line without output file

If you do not specify an output file, the application is opened with the resulting image. For example:

lazpaint image.png /RotateCW

will open the image with a 90° rotation.

Line without input file

You can also create an image out of nothing. For example :

lazpaint /New(800,600) /Gradient(255,255,255,255,0,0,0,255,Linear,0,0,800,600) blackwhite.png

will create an image with a black and white gradient and save it into blackwhite.png.

General commands

Here is the list of supported commands :

/HorizontalFlip : flips image horizontally
/VerticalFlip : flips image vertically
/SwapRedBlue : swaps red and blue channels
/RotateCW : rotates image clockwise
/RotateCCW : rotates image counterclockwise
/Resample(Width,Height: Integer) : resample image to Width x Height
/Opacity(Value: Byte) : applies a global factor to opacity
/Gradient(red1,green1,blue1,alpha1,red2,green2,blue2,alpha2: Byte; type; x1,y1,x2,y2: Single) : draws a gradient. Type can be Linear, Reflected, Diamond or Radial.
/New(Width,Height) : creates a new empty image of Width x Height

For example :

lazpaint bigimage.bmp /Resample(320,200) smallimage.png

will save a small copy of bigimage.bmp into smallimage.png

Filter commands

You can apply filters with default values. Here is the list of filter commands:

Blur filters : BlurPrecise, BlurRadial, BlurFast, BlurCorona, BlurDisk, BlurMotion, BlurCustom

Pixel filters : Sharpen, Smooth, Median, Emboss, Contour, Grayscale, Negative, LinearNegative, Normalize, SmartZoom3

Deformation filters : Sphere, Twirl, Cylinder, Plane

Rendering filters : PerlinNoise, CyclicPerlinNoise, Clouds, CustomWater, Water, Wood, WoodVertical, Plastik, MetalFloor, Camouflage, SnowPrint, Stone, RoundStone, Marble