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Working with Image Files. Aaron Fuegi [email protected]. Working with Image Files - Topics. Image Files Compression, Resolution, Formats, etc... Applications Batch processing Working with image sets or sequences Movies MPEG, DVD Publications Resolution Color space. Image Files. - PowerPoint PPT Presentation
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Working with Image FilesWorking with Image Files
Aaron [email protected]
IS&T Scientific Visualization Tutorial – Spring 2010
Working with Image Files - TopicsWorking with Image Files - Topics
Image Files– Compression, Resolution, Formats, etc...– Applications
Batch processing– Working with image sets or sequences
Movies– MPEG, DVD
Publications– Resolution– Color space
IS&T Scientific Visualization Tutorial – Spring 2010
Image FilesImage Files
P33 3 255 0 0 0 128 0 0 255 0 0 128 128 128 0 128 0 0 255 0 255 255 255 0 0 128 0 0 255
IS&T Scientific Visualization Tutorial – Spring 2010
• PPM Image File – 24 bit color, 3 pixels by 3 pixels
Image Files - IssuesImage Files - Issues Compression
– None, Lossless, or Lossy– Huge difference – 100 to 1 file size
Image Size/Resolution– Pixels vs. DPI (Dots per inch)– Web or Printing
Web support – JPEG, PNG, GIF Color Depth
– 24bit vs. 8bit – much less of an issue than it used to be
IS&T Scientific Visualization Tutorial – Spring 2010
Image Files - FormatsImage Files - Formats JPEG – Web, 24bit, Lossy, Small file size PNG – Web, 24bit GIF – Web, 8bit, Color lookup table TIFF, RGB, PPM – 24bit, Large file size, High
quality PSD – Photoshop’s format
– Editable text, Layers, etc… RAW – Digital camera formats, multiple MANY others
IS&T Scientific Visualization Tutorial – Spring 2010
Image Files - ApplicationsImage Files - Applications Viewing, Resizing, Manipulating Images Adobe Photoshop
– Windows/Macintosh– GUI, Very powerful, Expensive– Most popular general image editing package
XV– Mostly an image viewer but some editing capability– GUI, Linux, Free, Easy to use, No longer being updated
ImageMagick– Command-line tools– Linux, Free
IS&T Scientific Visualization Tutorial – Spring 2010
Adobe PhotoshopAdobe Photoshop
IS&T Scientific Visualization Tutorial – Spring 2010
XVXV
IS&T Scientific Visualization Tutorial – Spring 2010
ImageMagickImageMagick Add a blue border around image (expand?, replace?,
shrink?)– convert -border 10x10 -bordercolor "#6699ff" fan.png fan2.png
Add a caption/attribution– convert -font helvetica -fill red -pointsize 14 -draw 'text
446,404 "[email protected]"' fan2.png fan3.png
IS&T Scientific Visualization Tutorial – Spring 2010
ImageMagick - ToolsImageMagick - Tools Convert
– Convert image formats.– Many image transformations available – scale, rotate,
text, artistic filters Display Import
– Screen capture under Linux Identify
– Find out characteristics of image Composite
– Composite multiple images together
IS&T Scientific Visualization Tutorial – Spring 2010
Batch ProcessingBatch Processing Working with a set or sequence of images
– All images generally must be the same size Adobe Photoshop
– Recording and applying actions Perl (or another computer language)
– Extremely flexible but requires programming background or help
– Augments command-line tools such as ImageMagick
IS&T Scientific Visualization Tutorial – Spring 2010
MoviesMovies ImageMagick (Animated GIFs only)
– convert -delay 20 –loop 0 file*.gif anim.gif– animate anim.gif
Adobe Premiere– Movies– Displaying on computer or DVD?– Formats – QuickTime or AVI
Adobe Encore– DVDs– Menus, Controls, Chapters, etc…
IS&T Scientific Visualization Tutorial – Spring 2010
Images in PublicationsImages in Publications Resolution
– Web – generally around 100 DPI– Print – generally 600 DPI – match journal specifications
• Re-render image at very large scale. Do not just scale up. File Format
– Use a lossless 24-bit color format such as TIFF or PNG Color Space
– Web – RGB (standard)– Print – CMYK
Printing– Color gamut – Additive vs. subtractive color
IS&T Scientific Visualization Tutorial – Spring 2010
Working with Image Files - Questions?Working with Image Files - Questions?
Aaron [email protected]
http://scv.bu.edu/documentation/tutorials/ImageFiles/
IS&T Scientific Visualization Tutorial – Spring 2010