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Raster/Paint Software

Learn about Adobe Photoshop, raster graphics, color models, file formats, tools, and commands in computer graphics. Understand how photographic images are created with film-based photography and digital capture. Discover the power of selection and modification tools in Photoshop.

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Raster/Paint Software

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  1. INTRODUCTION Raster/Paint Software • Film-based photography was the foundation for graphic reproduction starting in early 1900s • Raster/paint software developed to work with scanned images • Adobe Photoshop: Dominant image-editing program and electronic painting software program in world Introduction to Computer Graphics

  2. CONCEPT 1 Photoshop: An Overview Introduction to Computer Graphics

  3. CONCEPT 1 Photoshop: An Overview • Bitmap-based application • Every image made up of a series of dots called pixels • Wide range of tools to adjust and correct color, contrast and dynamic range • Powerful type handling tools • Capable of handling web-based graphics Introduction to Computer Graphics

  4. CONCEPT 2 How Are Photographic Images Created? • Film-based images • Scanners • Digital Image Capture Introduction to Computer Graphics

  5. CONCEPT 2 Film-based Images • Emulsions • Prints • Transparency film Introduction to Computer Graphics

  6. CONCEPT 2 Scanners • Flatbed scanners • Drum scanners Introduction to Computer Graphics

  7. CONCEPT 2 Digital Image Capture Digital cameras Introduction to Computer Graphics

  8. CONCEPT 3 Resolution and Color • Raster art or Bitmapped art • Series of dots arranged in a grid • Dots vary in value and color • Resolution • Color Models • File formats Introduction to Computer Graphics

  9. CONCEPT 3 Resolution • Number of dots that make up an image • Raster images are resolution dependent • Four ways to measure resolution • LPI: Lines per inch • SPI: Spots per inch • DPI: Dots per inch • PPI: Pixels per inch Introduction to Computer Graphics

  10. CONCEPT 3 Color Models • Three important color models • RGB as a design tool • Red, green, blue • Additive primary colors • CMYK for color correction • Cyan, Magenta, Yellow, Black • Subtractive color • Grayscale Introduction to Computer Graphics

  11. CONCEPT 4 Open and Save Files • Working with Documents • File>New • Size • Orientation: Portrait or Landscape • Color Mode: Another name for color model • Background contents • File>Open • File>Save • File>Save As • File>Save for web Introduction to Computer Graphics

  12. CONCEPT 4 File Formats • .PSD: Photoshop Document • Native Photoshop format, • Preserves layers • Access to all tools and commands Introduction to Computer Graphics

  13. CONCEPT 4 File Formats • .TIF: Tagged Image File Format • Any resolution, grayscale or color • Generally used for graphics files to be printed • .EPS: Encapsulated Postscript • Specialized format for bitmap or vector graphics • .JPG: Joint Photographic Experts Group • Compressed image format • Often used for complex photographic images • .GIF: Graphics Interchange Format • Used specifically for the Web Introduction to Computer Graphics

  14. CONCEPT 5 Everyday Toolsand Commands • Photoshop interface similar to Illustrator • Rulers and Guides used to position elements on the page • Toolbox basics Introduction to Computer Graphics

  15. CONCEPT 5 Toolbox • Divided into 4 main areas • Selection tools • Cropping tools • Modification tools; clone stamp, history brush, eraser, gradient, blur/sharpen tools • Vector/type tools • Miscellaneous tools; eyedropper, zoom tools Introduction to Computer Graphics

  16. CONCEPT 5 Selection Tools • Main selection tools: Marquee selection tools, Move tool, Lasso tools, Magic Wand tool, and Slice tool • Crop tool is part of main selection tools,to reducefile size aswell as a design decisiontool Introduction to Computer Graphics

  17. CONCEPT 5 Modification Tools • Manipulate images in various ways • Fix damaged photographs • Paint or draw on images • Copy parts of images • Restore pixels deleted or erased • Color gradients Introduction to Computer Graphics

  18. CONCEPT 5 Vector/Type Tools • Although primarily used to work with bitmapped images, Photoshop contains a comprehensive array of type and vector-based tools • Vector/type tools similar to Illustrator • Eventually the vector shapes are converted to dots when file is saved to a format other than native .psd Introduction to Computer Graphics

  19. CONCEPT 5 Miscellaneous Tools • Perform a variety of tasks such as magnification, color identification in a specific area of an image, and electronic sticky-type notes Introduction to Computer Graphics

  20. CONCEPT 6 The Power of Selection! • Modify only a portion of an image • Create photomontage that use only pieces of images • Selection tools include • Marquee selection tools • Lasso tools • Magic wand tool Introduction to Computer Graphics

  21. CONCEPT 6 The Power of Selection! Introduction to Computer Graphics

  22. CONCEPT 6 Marquee Selection Tool • Rectangles or squares • Ovals or circles • Single row pixels horizontally and vertically Introduction to Computer Graphics

  23. CONCEPT 6 Lasso Tools • Surround portion of image with a line • Accuracy of selection depends on accuracy of mouse movements or pen and tablet • Three variations • Lasso • Magnetic Lasso • Polygonal Lasso Introduction to Computer Graphics

  24. CONCEPT 6 Magic Wand Tool • Attempts to select a range of values, based on 256 color values • Tolerance lets you set the range of values • Smaller tolerance number; the narrower the value range (color and shades) of the selection • Higher tolerance numbers; the wider the value range of a selection • Tool works best is image has well defined areas of value Introduction to Computer Graphics

  25. CONCEPT 7 It All Works with Layers • Using layers, Photoshop separates multiple images onto transparent layers • Can manipulate each layer without affecting other images in project • Layer Effects can add excitement and dynamics to design Introduction to Computer Graphics

  26. CONCEPT 7 Working with Layers • Layers palette is control center for layers in a file • Background layer has special properties • Can add, delete, duplicate layers • Change layering order Introduction to Computer Graphics

  27. CONCEPT 7 Layers Effects • Special effects to add visual impact, such as blending, drop shadows, color overlays, bevel and emboss Introduction to Computer Graphics

  28. CONCEPT 8 Transforming Images • Transformation tools give power and control over images • Healing Brush and Patch tools • Clone Stamp tool • Eraser tool • Blur, Sharpen, and Smudge tools • Dodge, Burn, and Sponge tools Introduction to Computer Graphics

  29. CONCEPT 8 Healing Brush and Patch Tools • Use brush size to regulate selected and modified area • Valuable for fixing old and/or damaged photos • Areas repaired blendin with adjoining areas Introduction to Computer Graphics

  30. CONCEPT 8 Clone Stamp Tool • Samples a particularsection of an image and recreates it over and over again • Also used to cover up areas of a photo with different imagery Introduction to Computer Graphics

  31. CONCEPT 8 Blur, Sharpen, and Smudge Tools • Alters specific parts of an image • Works by clicking anddragging mouse • Options allow fine-tuning of tool effect Introduction to Computer Graphics

  32. CONCEPT 8 Dodge, Burn, and Sponge Tools • Related to traditional film-based photography • Burn tooldarkens an image; Dodge toollightens it • Sponge heightensor mutes color Introduction to Computer Graphics

  33. CONCEPT 9 Photoshop Has Too Much Fun with Type • Dedicated Type Layer • Similar to vector-draw programs • Character palette lets you change • Type size • Leading • Alignment Introduction to Computer Graphics

  34. CONCEPT 9 Photoshop Has Too Much Fun with Type • Transformation tools work on type too! • Layer effects applied to type • Warp type: still remains editable after warp effect is applied Introduction to Computer Graphics

  35. CONCEPT 10 How Photoshop Files Are Output • Designers don’t normally output Photoshop directly from application • More often imported into another application, then output from there • Print preview dialog box allows for selection of printer, number of copies, scaled outputs and output modes Introduction to Computer Graphics

  36. CONCEPT 10 Printing Tools in Photoshop • Photoshop lets you color-manage the output to create more consistent color output between different devices Introduction to Computer Graphics

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