Intro to Digital Graphics
Intro to Digital Graphics VC 114
Chemeketa Community College
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This 4 page Class Notes was uploaded by Dashawn Anderson DDS on Monday October 5, 2015. The Class Notes belongs to VC 114 at Chemeketa Community College taught by Peter Hoelter in Fall. Since its upload, it has received 32 views. For similar materials see /class/219426/vc-114-chemeketa-community-college in Visual Arts at Chemeketa Community College.
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Date Created: 10/05/15
VC 114 Week 02 1 of 4 06 October 2008 week t Pixels amp Resolution The Pixel o The building blocks ofa raster image Understanding Resolution 0 Simply put resolution is a way of talking about how much information is stored in any given digital image 0 This is sometimes called spatial resolution 0 When talking about digital images in regards to display on a computer monitor resolution is defined by the pixel dimensions ofan image 0 When talking about digital images in regards to printing resolution is defined as the number of pixels per inch ppi This refers to the amount of pixel information an image contains per printed inch that will be sent to the printer 0 An image s pixel dimensions does not determine an image s printing size An image s pixel size is independent from its printing size While viewing an image on screen only pixel size matters 0 When talking about a printer39s resolution resolution is defined as the number of dots per inch dpi a printer is capable of outputting 0 Sample output device resolutions Computer monitors average 72 to 130 ppi iPhoneiPod touch is 163 ppi Laser amp inkjet printers range between 600 to 4800 dpi High end imagesetters and film output average 2400 dpi Resolution and File Size 0 Both low and high resolution images come with their own pros and cons The lower the resolution The higher the resolution JThe smaller the file size XThe larger the file size JThe quicker an image prints XThe longer it takes an image to print JThe less demanding it is on a XThe more demanding it is on a computer39s resources computer39s resources XThe more detail that is lost J Often but not always a better image 0 It s important to find the right resolution for the job know your output device before starting work on an image 0 When in doubt always maintain a higher resolution You can always down sample an image but rarely up sample one Recommended Resolutions 0 Recommended ppi based on the final printdisplay size of an image Image Type Resolution Line art black amp white bitmaps 600 ppi Photographs for professional printing 300 ppi Photographs for standard printers 150 200 ppi Web graphics jpeg or gif 72 ppi Demonstration Outline vc 114 WEEK D2 2 am as October zuua Color Spaces Color Spaces in Photoshop 0 Each color space in Photoshop has a different purpose Some allow for only two colors while others allow for over 167 million different colors 0 These spaces are not proprietary to Phomshopithey are universally used The number of colors an image can smre is sometimes referred to a the tonal resolution of an image 0 Bquot per Max 1 of Colors Pixel 1blt 8 bits Color 24 bits 167 rnllllon 732 Kb Color 32 bits lt 16 7 rnllllon 977 Kb Color 24 bits 16 7 rnllllon 732 Kb on a Channels Overview 0 Phomshop uses channels to provide advanced access m the different color components of an image n image is composed of one or more 87bit channels Channels are essentlaiiv sabit grayscale images RGB uses three seblt channels One each for Red Green and Blue CMYK used four seblt channels One each for Ivan Magenta Yellow and Black Bltmapped Gravscaie and index lrnage contain a single channel that is tailored to their particular color spaces Sample Channels Palettes rl l ll39ll ieiJinii39l l i4 lal i a 24bit RGB lrnage 32bit CMYK image Ti39ll e6 Channels r 4Lii39 cilal ll39lek 86bit Gravscaie lrnage One rharlnal a Dem unstratlun outline a VC 114 Week 02 3 of 4 06 October 2008 Introduction to Photoshop History Photoshop39s work area 0 Palettes menus amp windows Tools 0 New CS3 Toolbar 0 Keyboard shortcuts o Hover tool tips 0 The Option bar Menus 0 Command highlighting with Workspaces Palettes o Customization of o Palette submenus 0 Tab key Showhide all palettes 0 History palette Document Window 0 Image window title info icon name zoom level amp color mode 0 Close minimize maximize 0 Document change indicators red window widget document icon 0 Status bar menu Views Navigator Palette Window gt Navigator Hand tool H Actual Pixels Command Option O Fit to Window Command 0 Zoom inout Command and Command Screen Mode Standard Screen Maximized Screen Mode Full Screen with Menu Bar Full Screen F 000000 Setting Preferences 0 Preferences shortcut Command K Rulers and Guides 0 Use View gt Rulers Command R to showhide the document ruler 0 To change the ruler units right click on the ruler them select the unit you wish to use This can also be done via this menu Photoshop gt Preferences gt Units amp Rulers 0 To create a guide click on a ruler and drag the cursor into the image area To remove a guide select the Move tool V then click and drag the guide back onto the document ruler Demonstration Outline vc 114 Week 02 4 on 05 October 2005 Canvas Size and Image Size Image Size Manipulams the size of the artwork sometimes altering existing pixel data according to the provided settings t he image size is made smaiier or bigger than the current size the image itseitscaies to the new width and height The Resample Image checkbox is checked photoshoo wiii add or remove pixeis to achieve the new width and height H it is not checked then the pixeis will not be altered Imagesue Pixelolmensmns 7031K Wldlh 150 xels Heigmi 1400 Dutumenr size a Widlh 15 Inches Height 4 indies Resoturion i100 pixelsind 7g caie St 125 Etonsrrain Proportions Ekesampie Image EiCubK Canvas Size Controls the size of the artboard but does not resample exisu ng artwork arger the new emotv space is tiiied in with the Canvas extension coior Speci ed in the diaiog x Canvas size is made smaiier than the current size the image is simoiv e new width and height Use the Anchor option to controi Where new canvas area WiH be added in reiation to the existing image Q o u m a 639 Canvas Size Currentsize 7031K Widlh 600 pixeis Height 400 pixeis 7 New SllE 7021K width 500 plxels 143 Hei K39 400 Pixels lquot Canvas extension uior Barkgmund 3m 7 Demonstration ouuirie 7
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