BPC: Art and Computation – Summer 2007BPC: Art and Computation – Summer 2007

Lesson Plans 4 and 11Lesson Plans 4 and 11Corel PainterCorel PainterImage Manipulation and PaintingImage Manipulation and Painting

Laura Giannitrapani

laura@bu.edu

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Three course modules use Three course modules use Corel PainterCorel PainterImage manipulation – editing or

combining images from photos, scans or other computer graphics sources.

Painting - a paint system with very powerful and intuitive digital paint brushes and media.

Flipbooks – simple animation creation and playback.

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Why use Corel Painter?Why use Corel Painter?

For creating and modifying images for mapping onto polygonal surfaces in the virtual environment– Standalone images– Surface textures – i.e. rock walls, animal fur– Create an animation from a sequence of

images– Use alpha channels to create a cut out effect

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Frames from the Flipbook project

View of the Fall’06 Final project

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Tutorials and HelpTutorials and Help

Corel Painter Welcome pageLynda.com training DVDsCorel Painter User Guide

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Corel Painter “Welcome” page

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Lynda.com training DVDs

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Corel Painter User Guide

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File ManagementFile Management

Review the importance of saving and backing up files

Describe to the students where they should save their files whether it’s on a file server, the local workstation, or a personal storage device.

Describe the backup policies and procedures.– Students can backup their own files on CDs or

USB keys – A systems person can backup a server.

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User Interface and primary menu User Interface and primary menu structurestructure Conduct a brief tour of the user interface

and note where these items are and what they are used for:– Toolbox– Color palette– Mixer pad– Color sets– Brush menu– Property Bar

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User Interface and primary menu structure

ToolboxToolbox

Color paletteColor palette

Mixer padMixer pad

LayersLayers

Main menuMain menu

Property barProperty barBrush menuBrush menu

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Additional palettes

– Info

–Layers

–Channels

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Additional palettes for image manipulation

InfoInfo

LayersLayers

ChannelsChannels

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Image ManipulationImage Manipulation

Understanding layersTools and functionsImages for DAFFIE

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Understanding LayersUnderstanding Layers

Layers provide a powerful and flexible method for composing and editing images.

Various operations will generate new layers including:– Importing additional images– Copy and pasting

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Illustration of layers conceptIllustration of layers concept

Individual layers Final image

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Tools and functionsTools and functions

RotationCroppingScalingSelectionCopy/paste

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Rotating the canvasRotating the canvas

Original image After rotation

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Selection and copy/pasteSelection and copy/paste

Original image After selection, rotation, and copy/paste

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Tools and functions - continuedTools and functions - continued

ResolutionAspect ratio– The proportion of the width and height

of and image– Should be consistent between the

image file and the polygon that it will be mapped onto

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Tools and functions - continuedTools and functions - continued

Rubber stamp– For covering up unwanted image areas

with an image “stamp”Eraser – Erase part of the upper layer to reveal

part of the lower layerAlpha channels – For creating transparent areas in an

image in VR

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Alpha ChannelsAlpha Channels

The optional fourth channel in a .tif file:– r + g + b + a

Causes the file to be 32 bits rather than 24 bits.

Use the channels menu for creating an alpha channel.

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The leaves are a texture map with an alpha channel. The leaves appear to be cut out of the texture map.

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The various ways to view an image with an alpha channel

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.RIF file format.RIF file format

The .RIF format is Corel Painter’s native format which stores all of the layer information, brush information, and other information useful for editing and image.

DAFFIE and Maya cannot read a .RIF file.

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Images for DAFFIEImages for DAFFIE

Save a .tif file and convert to .rgbThe .tif format supports alpha

channelsMemory is allocated in powers of 2:

64, 128, 256, 512, 1024 The aspect ratio of the image should

match the aspect ratio of the polygon

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Images for DAFFIEImages for DAFFIE

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PaintingPainting

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Color mixing and Color mixing and selectingselecting Can create a

collection of custom mixer pads and color sets and save them for future use.

Can create a color set from a mixer pad or an image.

There are 16.7 million colors possible with Corel Painter.

Color paletteColor palette

Mixer padMixer pad

Color setColor set

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Mixing colors exerciseMixing colors exercise

Students explored creating three families of colors:– Browns – rocks, ground fur– Blues – water, sky– Greens – trees, vegetation

Students saved mixer pads and color sets for each of the three color groups.

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BrushesBrushes

Brush categories – Brushes, pens, pencils, chalk,

airbrushes, palette knivesBrush variants– For each type of tool, there are different

sizes, opacities, grain, shape, stiffness, etc. to choose from.

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Paper selectorPaper selector

The paper selector in the toolbox has many options for canvases, paper types, wood grain, etc. for surfaces to paint on.

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Kellen Shelendewa’s Brown Texture uses several brushes with different properties