04/12/2023RU ITG Best Practices- Graphics

PowerPoint Presentations:Graphics Basics – Part 1

Ross Health Sciences

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Initial Problems• Most people just place images into

PowerPoint® without paying any attention to the image’s type and attributes

• Scanners/cameras may not be set correctly and/or images may not be correctly reformatted prior to use for on-screen viewing

• Screen resolution limits not understood

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Initial Problems• May have limited image manipulation

knowledge /skills (use of imaging software)• May not be aware of/use retouching

features built into the PowerPoint® program• May not be willing to take the time to

reformat incorrect images in use or willing/able to re-acquire correctly formatted images snowball effect

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Rules of Thumb• Use proper image type- to maximize both

viewing quality and size compression• Don’t be leery of image programs- simple

steps and processes can yield quick and optimal results- shallow learning curve for most needs

• Know the limits of screen resolution

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Best Practices1. Acquire images in high-end format to

archive for possible uses other than screen (printing)- TIFF

2. Copy original to 2nd archive folder for on-screen version and translate for screen-limit resolution- JPEG

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Best Practices3. Keep original TIFF and JPEG secure and

pristine- work with copies only4. Put working copies of JPEG into folders

adjacent to associated presentations5. Avoid serial resave of JPEGs- get new copy

04/12/2023RU ITG Best Practices- Graphics

Text is Behind

Best Practices

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GIF

JPEGPNG

Text is in Front

Use for simple

graphics like ClipArt

Use for the vast majority of

photographic media types

Use only when transparency is

essential

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Common Sources• Textbook Scans• Microscope Scans• Digital Diagnostic Images• Digital Image Databases• Digital Camera Photographs• Web Graphics• Clip Art• Personal Art Scans• Computer Graphic Illustrations

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Image Dissection• Right-click over an image in a folder

and choose properties and define what is there with the General and Summary Tabs

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Image Dissection

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Image Dissection1436px/300ppi= 4.79 inches

1464px/300ppi= 4.88

inches

Double-click image to bring up Format tab and you will see the actual

size (4.88x4.79)

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28= 8 Bits [256] per color channel (R,G,B)= 24-Bit or 2563= 16.7

million colors; true-color image

Bit Depth

12

21= 1 Bit (Black or White pixels

ONLY- monochrome)

28= 8 Bit (256 shades from BW;

grayscale)

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9MB TIFF

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420KB JPEG or 9MB TIFFWhich is Which?

Image A Image B

TIFF

Click Here for Answer

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420KB JPEGEnlarged 133%

Apparent resolution

2/3s * 150= 100PPI

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600KB JPEG or 2.8MB TIFF- Which is Which?

Image A Image B

Click Here for Answer

TIFF

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56KB JPEG or 2.8MB TIFFWhich is Which?

Image A Image B

TIFF

Click Here for Answer

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290KB JPEG or 36.7MB TIFF (cropped)Which is Which?

Image A Image B

Click Here for Answer

TIFF

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397KB JPEG (cropped)

Actual Size 0.62x0.58inches

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12x enlarged =7.08x7.56inches

Appearance 100PPI

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Morale of the Story• Screen resolution is screen resolution

images with higher resolution will not display any better, but will take up much more file space, cause huge presentations, slow everything down and increase failures

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