GIMP IN WINDOWS..aztcs.org/meeting_notes/winhardsig/photoedit/GIMP.pdf · "GIMP" in "Windows.."...
Transcript of GIMP IN WINDOWS..aztcs.org/meeting_notes/winhardsig/photoedit/GIMP.pdf · "GIMP" in "Windows.."...
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Web location for this presentation:
http://aztcs.orgThen click on "Meeting Notes"
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SUMMARY
"GIMP" is a free photo editing app for a "Windows.." computer. "GIMP" is the most feature-rich and most complex of the photo editing apps that are free.
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TOPICS• Evaluation of "GIMP" in "Windows 10"
• Installing "GIMP"
• "UFRAW" Converter/Add-On for Opening Some RAW Photo Files
• Steps for Using "GIMP"
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TWO-PAGE REPORT CARD FOR "GIMP" IN "WINDOWS..":
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"GIMP" in "Windows.." Page 1 of 2
Can import .JPG files into a photo project Yes
Can import .PNG files into a photo
projectYes
Can import .TIF files into a photo project Yes
Can import .BMP files into a photo
projectYes
Can import the Canon RAW files from
https://raw.pixls.us/ into a photo projectNo
Can import the Nikon RAW files from
https://raw.pixls.us/ into a photo project
Yes with
UFRAW
Can import the Sony RAW files from
https://raw.pixls.us/ into a photo project
Yes with
UFRAW
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"GIMP" in "Windows.." Page 2 of 2
Can tilt a photo project either 90 or 180 or
270 degreesYes
Can tilt a photo project a specific number of
degrees from 0 to 359 degreesYes
Can adjust the brightness of a photo project Yes
"Gamma" adjustment of the input-output
brightness "x-y" curve of a photo projectYes
Can adjust the contrast of a photo project Yes
Can perform a rectangular crop on a photo
projectYes
Spot Removal and Red Eye Removal Yes
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INSTALLING THE FREE "GIMP" INTO A "WINDOWS.." COMPUTER
• "GIMP" is an acronym that stands for "GNU Image Manipulation Program"
• Start a Web browser.
• Go to https://www.gimp.org/
• Click on the "Download.." button
• Etc.
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"UFRAW" CONVERTER/ADD-ON
• The "UFRAW" converter/add-on is a separate app that can convert some RAW photo files into a format that "GIMP" can open
• UFRAW is available for free at http://ufraw.sourceforge.net/Install.html#MS
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"UFRAW" CONVERTER/ADD-ON (continued)
• The free "UFRaw" converter/add-on is unable to convert Canon RAW files into a format that GIMP could handle.
• The free UFRaw converter/add on is able to convert Nikon and Sony RAW files into a format that GIMP could handle.
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STEPS• To rotate in 90-degree increments:
Image, Transform, Rotate 90 degrees clockwise or Rotate 90 degrees counter-clockwise
• To rotate in 1-degree increments: Image, Transform, Arbitrary Rotation..
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STEPS (continued)• To crop a photo:
Tools, Transform Tools, Crop, use left mouse key to drag over the desired rectangular section, click inside the rectangular section or press the "Enter" key to crop
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STEPS (continued)• To adjust brightness:
Colors, Brightness-Contrast, Brightness slider
• To adjust contrast: Colors, Brightness-Contrast, Contrast slider
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STEPS (continued)
• Red eye removal: View, Zoom, Zoom In, + + + etc. (previous step is optional) Select the area around the red eye (previous step is optional) Filters Enhance Red Eye Removal..
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STEPS (continued)
• To get the best results, you can fine tune the "Red Eye Removal" filter in GIMP as described at https://zypath.com/how-to-get-it-done/gimp-beginner-red-eye-removal/
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STEPS (continue)• To ways to adjust "gamma":
METHOD ONE: Colors, Levels, Then, to change the "gamma", value change the following number:
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STEPS (continue)• Reference for the previous two
images: https://medium.com/@miha.kadunc/in-gimp-gamma-adjustment-is-done-within-the-colors-levels-dialog-the-middle-box-under-the-87ecfe4e9db0
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STEPS (continue)• According to the reference in the
previous slide:
• <Start of quote:> In GIMP, gamma adjustment is done within the “Colors”/”Levels…” dialog — the middle box under the “Input Levels” histogram is the gamma value (unfortunately placed right next to the “Clamp input” checkbox). <End of quote:>
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STEPS (continued)• METHOD TWO TO ADJUST GAMMA:
To manually adjust the (RGB) Input-Output brightness curve for a digital photo: Colors, Curves, make sure that Channel is defaulted or set to "Value": adjust for a sag, hump, or S-type input-output curve GAMMA adjustment is overall bend of the curve
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STEPS (continued)
• To remove a spot such as a facial blemish in GIMP: Tools, Paint Tools, Heal, etc.
• See https://docs.gimp.org/en/gimp-tool-heal.html