Difference between revisions of "LazPaint"

Revision as of 17:40, 28 July 2012

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

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. For developpers, svn command line is :

svn co https://lazpaint.svn.sourceforge.net/svnroot/lazpaint lazpaint

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 do/undo the 50 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 drawings tool 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 do 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.

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.

BMP : uncompressed bitmaps
PNG : lossless compressed bitmaps
JPG : lossy compression
PDN : file with layers from Paint.NET (image is flattened while loading)
GIF : user can choose a frame
ICO : user can choose a size

Output formats

BMP, PNG and JPG

Image manipulation

Image can be resampled, flipped horizontally and vertically.

Smart zoom x3 : resize the image x3 and detects borders, to have 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, command prefix is '-'. on Windows, 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