Pen and Ink.color

download Pen and Ink.color

of 20

Transcript of Pen and Ink.color

  • 7/29/2019 Pen and Ink.color

    1/20

    Non-Non-PhotorealisticPhotorealistic RenderingRendering

    Pen-and-Ink IllustrationPen-and-Ink Illustration

  • 7/29/2019 Pen and Ink.color

    2/20

    Stylized IllustrationsStylized Illustrations

    As compared toAs compared to photorealisticphotorealistic images,images,sometimes:sometimes:

    Convey more informationConvey more information

    Allow more compact storageAllow more compact storage

    More easily reproducedMore easily reproduced More attractiveMore attractive

  • 7/29/2019 Pen and Ink.color

    3/20

    Illustration ApplicationsIllustration Applications

    Architectural designArchitectural design

    Medical textsMedical texts

    Industrial repair manualsIndustrial repair manuals

  • 7/29/2019 Pen and Ink.color

    4/20

    Types ofTypes of

    Non-Non-PhotorealisticPhotorealistic RenderingRendering

    Pen-and-ink DrawingsPen-and-ink Drawings

    PaintingsPaintings

    Rendering enhancementsRendering enhancements

    Other artistic modalitiesOther artistic modalities

    e.g. screening, floral ornamentation,e.g. screening, floral ornamentation,cartoons, etc.cartoons, etc.

  • 7/29/2019 Pen and Ink.color

    5/20

    Pen and Ink ConceptsPen and Ink ConceptsStrokesStrokes

    Curved lines of varying thickness andCurved lines of varying thickness anddensity of placementdensity of placement

    TextureTexture

    Character conveyed by collection of strokes,Character conveyed by collection of strokes,e.g. crisp and cleane.g. crisp and clean vsvs. rough and sketchy. rough and sketchy

    ToneTone

    Perceived gray level across the imagePerceived gray level across the image

    OutlineOutline

    Boundary lines which disambiguateBoundary lines which disambiguatestructure informationstructure information

  • 7/29/2019 Pen and Ink.color

    6/20

    Algorithm GoalAlgorithm Goal

    Place strokes on surfaces to achievePlace strokes on surfaces to achieve

    particular tone functionsparticular tone functions

    fromfrom WinkenbachWinkenbach andandSalesinSalesin. Rendering. Rendering

    Parametric Surfaces in PenParametric Surfaces in Pen

    and Ink.and Ink. Proceedings ofProceedings of

    SIGGRAPH 96SIGGRAPH 96. Page 471.. Page 471.

  • 7/29/2019 Pen and Ink.color

    7/20

    Algorithm ComponentsAlgorithm Components

    Tone specificationTone specification

    Stroke placementStroke placement

    Stroke width computationStroke width computation

  • 7/29/2019 Pen and Ink.color

    8/20

    Tone SpecificationTone Specification

    Gray levels may be assigned according toGray levels may be assigned according to

    conventional rendering:conventional rendering:

    Local/global IlluminationLocal/global Illumination

    Material colorMaterial color

    Texture mappingTexture mapping

    Bump mappingBump mapping Environment mappingEnvironment mapping

    Shadow mappingShadow mapping

  • 7/29/2019 Pen and Ink.color

    9/20

    Stroke PlacementStroke Placement

    Places strokes alongPlaces strokes along isoparameterisoparameter lines oflines ofparameterized surfaceparameterized surface

    Choose density according to maximumChoose density according to maximumgray level and maximum allowable strokegray level and maximum allowable strokewidthwidth

    v

    u

  • 7/29/2019 Pen and Ink.color

    10/20

    Planar MapsPlanar MapsCompute visibility and store in planar mapCompute visibility and store in planar map

    Planar map is partition of image planePlanar map is partition of image plane

    Each partition corresponds to a visibleEach partition corresponds to a visibleportion of a primitive (curved surfaces areportion of a primitive (curved surfaces aretessellated).tessellated).

    Shadows may be explicitly represented asShadows may be explicitly represented asmap partitionsmap partitions

    Clip strokes according to planar mapClip strokes according to planar map

    Reduces computation and allows renderingReduces computation and allows renderingwith hidden surfaces already removedwith hidden surfaces already removed

    Create outlines from partition boundariesCreate outlines from partition boundaries

  • 7/29/2019 Pen and Ink.color

    11/20

    Planar Map ExamplePlanar Map Example

    fromfrom WinkenbachWinkenbach andandSalesinSalesin. Rendering. Rendering

    Parametric Surfaces in PenParametric Surfaces in Pen

    and Ink.and Ink. Proceedings ofProceedings of

    SIGGRAPH 96SIGGRAPH 96. Page 474.. Page 474.

  • 7/29/2019 Pen and Ink.color

    12/20

    Stroke WidthStroke Width

    Vary width across each stroke lineVary width across each stroke line

    S: (u,v)S: (u,v) ((xxww,,yyww,,zzww))V: (V: (xxww,,yyww,,zzww)) ((xxss,,yyss))M = V S : (u,v)M = V S : (u,v) ((xxss,,yyss))UseUse JacobianJacobian of M to estimate divergenceof M to estimate divergence

    of lines in screen spaceof lines in screen spaceAdjust width to account for divergence andAdjust width to account for divergence and

    desired tone along each strokedesired tone along each stroke

  • 7/29/2019 Pen and Ink.color

    13/20

    Advanced TechniquesAdvanced Techniques

    Recursive filler strokesRecursive filler strokes

    Allow larger gaps between strokes, then fillAllow larger gaps between strokes, then fillgaps by adding new strokesgaps by adding new strokes

    StipplingStippling

    draw stipple pattern along strokesdraw stipple pattern along strokes

    Cross hatchingCross hatching

    use more than one hatching directionuse more than one hatching direction

    Prioritized strokesPrioritized strokes

    strokestroke thicknessesthicknesses determined in prioritizeddetermined in prioritizedorderorder

  • 7/29/2019 Pen and Ink.color

    14/20

    Pen and Ink ExamplePen and Ink Example

    fromfrom

    WinkenbachWinkenbach

    andand

    SalesinSalesin. Rendering. Rendering

    Parametric Surfaces in PenParametric Surfaces in Pen

    and Ink.and Ink. Proceedings ofProceedings of

    SIGGRAPH 96SIGGRAPH 96. Page 474.. Page 474.

  • 7/29/2019 Pen and Ink.color

    15/20

    Pen and Ink ExamplePen and Ink Examplefromfrom WinkenbachWinkenbach andand

    SalesinSalesin. Rendering. Rendering

    Parametric Surfaces in PenParametric Surfaces in Penand Ink.and Ink. Proceedings ofProceedings of

    SIGGRAPH 96SIGGRAPH 96. Page 475.. Page 475.

  • 7/29/2019 Pen and Ink.color

    16/20

    Pen and Ink ExamplePen and Ink Example

    fromfrom WinkenbachWinkenbach andand SalesinSalesin. Rendering Parametric Surfaces. Rendering Parametric Surfaces

    in Pen and Ink.in Pen and Ink. Proceedings of SIGGRAPH 96Proceedings of SIGGRAPH 96. Page 476.. Page 476.

  • 7/29/2019 Pen and Ink.color

    17/20

    Other Variants of Pen and InkOther Variants of Pen and Ink

    OrientableOrientable TexturesTextures

    GreyscaleGreyscale image as input (describes tone)image as input (describes tone)

    User specifies direction field and strokeUser specifies direction field and strokecharactercharacter

    Stroke shaded image outputStroke shaded image output

    Real-time NPRReal-time NPR

    Fast visibility computation of silhouette andFast visibility computation of silhouette andother feature edgesother feature edges

    Render visible edges in modified stylesRender visible edges in modified styles

  • 7/29/2019 Pen and Ink.color

    18/20

  • 7/29/2019 Pen and Ink.color

    19/20

    Real-Time NPR ExamplesReal-Time NPR Examples

    fromfrom MarkosianMarkosian et al. Real-Timeet al. Real-Time

    NonphotorealisticNonphotorealistic Rendering.Rendering. ProceedingsProceedings

    of SIGGRAPH 97of SIGGRAPH 97. Page 420.. Page 420.

  • 7/29/2019 Pen and Ink.color

    20/20

    VideosVideos Salisbury, Wong, Hughes, andSalisbury, Wong, Hughes, and SalesinSalesin..

    OrientableOrientable Texture for Image-Based Pen-Texture for Image-Based Pen-and-Ink Illustration.and-Ink Illustration.Proceedings ofProceedings ofSIGGRAPH 97.SIGGRAPH 97.

    MarkosianMarkosian,, KowalskiKowalski, and Hughes. Real-, and Hughes. Real-TimeTime NonphotorealisticNonphotorealistic Rendering.Rendering.

    Proceedings of SIGGRAPH 97Proceedings of SIGGRAPH 97..

    Banks and Turk. Image-guidedBanks and Turk. Image-guidedStreamline Placement.Streamline Placement.Proceedings ofProceedings ofSIGGRAPH 96.SIGGRAPH 96.


Pen and photo

Pen and photo

9.pen and ink

9.pen and ink

SWORD and PEN - americancombato.com

SWORD and PEN - americancombato.com

Smart Insulin Delivery Pen Insulin Pen Needles...UltiCare Original Pen Needle - 12.7mm x 29G (1/2") UltiCare pen needles combine exceptional quality and convenience with the UltiGuard

Smart Insulin Delivery Pen Insulin Pen Needles...UltiCare Original Pen Needle - 12.7mm x 29G (1/2") UltiCare pen needles combine exceptional quality and convenience with the UltiGuard

Drafting Knife and Pen

Drafting Knife and Pen

Lexi Pens, Pen Manufacturer, Pen

Lexi Pens, Pen Manufacturer, Pen

pen and paper

pen and paper

PEN Team Bios Nov 2015 - PEN: Practice-based … PEN/PEN Team Bios No… · • PEN Global Content Development Team ... education and health informatics was developed. In ... community

PEN Team Bios Nov 2015 - PEN: Practice-based … PEN/PEN Team Bios No… · • PEN Global Content Development Team ... education and health informatics was developed. In ... community

Allergy and epi pen

Allergy and epi pen

Godiva Kylie - Cats Protection Pen 1 Kylie Pen 2 Theodore Pen 3 Sky Pen 4 Freddie Pen 5 Muffin & Scruffy Pen 6. be Sponsor PROTECTION Reg Charity 203644 (England and Wales) and SC037711

Godiva Kylie - Cats Protection Pen 1 Kylie Pen 2 Theodore Pen 3 Sky Pen 4 Freddie Pen 5 Muffin & Scruffy Pen 6. be Sponsor PROTECTION Reg Charity 203644 (England and Wales) and SC037711

Tablet and Digital Pen Device - Aiptekdownload.aiptek.de/Graphic Tablet/Hyper Pen Tablet/Hyper Pen 10000… · Tablet and Digital Pen Device User Manual Windows 2000 / XP / Vista

Tablet and Digital Pen Device - Aiptekdownload.aiptek.de/Graphic Tablet/Hyper Pen Tablet/Hyper Pen 10000… · Tablet and Digital Pen Device User Manual Windows 2000 / XP / Vista

PEN-1975 Isla Ball Pen guide and t’s & c’s

PEN-1975 Isla Ball Pen guide and t’s & c’s

PEN 1 & PEN 2 Seepage and Stability Analysesorsolutions.org/wp-content/uploads/2015/03/PEN-1-and-2-Seepage-an… · PEN 1 & PEN 2 Seepage and Stability Analyses ... Reverse Analysis

PEN 1 & PEN 2 Seepage and Stability Analysesorsolutions.org/wp-content/uploads/2015/03/PEN-1-and-2-Seepage-an… · PEN 1 & PEN 2 Seepage and Stability Analyses ... Reverse Analysis

Computer-Generated Pen & Ink Illustrationcs767/student_pres/imbrogno_winkenback.pdfWhy Pen & Ink? Combines well with text – Same pen and paper Economy of expression – Tone and

Computer-Generated Pen & Ink Illustrationcs767/student_pres/imbrogno_winkenback.pdfWhy Pen & Ink? Combines well with text – Same pen and paper Economy of expression – Tone and

IDEA-Pen: Interactive Design and Analysis through a Pen ... · IDEA-Pen: Interactive Design and Analysis through a Pen-based Interface Introduction For students to succeed in engineering

IDEA-Pen: Interactive Design and Analysis through a Pen ... · IDEA-Pen: Interactive Design and Analysis through a Pen-based Interface Introduction For students to succeed in engineering

18315 PEN Pen Producing Broker TOBA

18315 PEN Pen Producing Broker TOBA

Pen Chalet · Pen Chalet offers a wide selection of fine writing instruments, inks and accessories. ... original classic pen is one durable pen. SAVANNA fountain pen

Pen Chalet · Pen Chalet offers a wide selection of fine writing instruments, inks and accessories. ... original classic pen is one durable pen. SAVANNA fountain pen

Pen and Ink Drawing

Pen and Ink Drawing

Pen Drawing and Pen Draughtsmen 1889

Pen Drawing and Pen Draughtsmen 1889

Pen, Pencil and Poison

Pen, Pencil and Poison