GIMP image editing basics
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This document outlines a presentation on working with digital images. It includes: - An introduction and welcome from 00:00-00:10. - A discussion of digital image basics like pixels, file formats and camera megapixels from 00:10-00:30. - An introduction to the GIMP image editing software, covering the workspace, tools and basic functions, from 00:30-00:55. - Hands-on exercises with opening images in GIMP, scaling, cropping and doing color corrections from 00:55-01:25. - A summary and close of the presentation from 01:25-01:30.
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GIMP image editing basics
- 1. KERRY JOHNSON BSCI, DIP PM, CERT IV TAE CONTENT © KERRYJ Working with digital images
- 3. Our time together tonight… 00:00 - 00:10 Welcome 00:10 - 00:20 Some techy info about digital images 00:20-00:30 Choose and download images 00:30-00:45 Introduction to GIMP, basics of the workspace, menu setup 00:45-00:55 BREAK 00:55-01:10 Open image, scaling and cropping images 01:10-01:25 Colour correcting images 01:25-01:30 Summarise and close
- 4. Pixels – the base element of all images
- 10. What are you using your image for? Tree Frog size: 57.4 MB Dimensions in pixels: 2000h x 3000w Pixel density: 300 DPI (High quality) Computer monitors: 100-120 DPI Average internet image: 72 DPI https://www.iprintfromhome.com/mso/understandingdpi.pdf
- 11. Camera megapixels and image quality Megapixels = vertical x horizontal effective pixels of sensor. Also consider - print size at desired DPI, lens quality, controls, ease of use.
- 12. What’s in a digital image?
- 13. Image file formats for sharing Lossy compression Details removed, reduced file size JPG or JPEG Lossless compression Re-writes data, no loss of quality PNG (can be both)
- 14. Got an image to edit? If not - https://www.pexels.com/
- 15. Open GIMP
- 16. Workspace setup
- 17. Reshape Toolbox
- 21. OpenLayersmenu
- 22. OpenLayersmenu
- 23. Wherewe’reupto…
- 24. Wherewe’reupto… Is everyone seeing this?
- 25. Openingafile
- 27. Scalinganimage…
- 28. Scalinganimage…
- 29. Scalinganimage…
- 30. Scalinganimage…
- 32. Croppinganimage…
- 33. Croppinganimage… Make it smaller but “zoom in” on important elements
- 40. Savevs.Export Export = output as a standard file type such as .PNG, .JPG or .GIF Save = Save your project for later work Do BOTH of these
- 41. You now know how to Think about image and file size Set up your GIMP workspace Scale and crop images Colour correct and enhance images Save your work
- 42. Next steps Take your projects and files home Email me for a handout of this presentation Haunt YouTube for videos about GIMP Register interest for an intermediate course
- 43. KERRY JOHNSON BSCI, DIP PM, CERT IV TA CONTENT © KERRYJ Working with digital images kerryank@gmail.com
Editor's Notes
- I’d like to acknowledge we meet tonight on the land of the Kuarna people and respect their emotional, economic and spiritual ties to their land.
- By the end of this evening, you should have at least one finished project and have had the chance to experiment with some special effects.
- All digital images are made up of squares called pixels. As you have seen, the more you blow an image up, the more the square megapixels become obvious. This is known as pixilation. This is why you can’t blow up digital images to any size you want and have them look clear and crisp.
- With images, there are three main measures that will tell you about size and quality. The file size will tell you how much space it takes up in the memory of a device. 58 MB is hefty for an image. The dimensions tell you how much screen real estate the image is taking up. And the pixel density tells you how many image elements per square inch – which is annoying when you’re talking pixels I realise. What the ideal is depends on use. For an image to use on the internet – 300 DPI is overkill when you consider high resolution computer monitors don’t display much above 120 DPI. However – if you wanted to print your image as a full wall mural – this would be too small. Divide the dimensions in pixels by the DPI to get the inches. The widest this image would print well is 10 inches.
- If you didn’t bring an image – go to Pexels and download one
- It will come out long and skinny. Hover your mouse over on the side of the frame of the Toolbox and drag it until it’s a bit fatter. Set it off to the side.
- The parts of the GIMP workspace. You have the main image section. AT the top is the name of the file and the file size. GIMP will resize big images to fit your screen. You can see the Zoom down at the bottom. You have your Layers menu – and right now this is our only layer. The Toolbox menu indicates which tool is active. In this screenshot, the Font tool is active.
- Scaling an image
- Scaling an image
- Scaling an image
- Scaling an image
- Scaling an image
- To get away from this – just escape key
- To get away from this – just escape key
- I use Colours- levels – and view them via the option at the right – “Logartihmic histogram”. A histogram is a graphical display of data. In this case the shadow, mid and high tones of an image. A logarithm is a quantity or amount. So the logarithmic historgram is a more visual way to see the depth and amount of the low, mid and bright areas of an image.
- I use Colours- levels – and view them via the option at the right – “Logartihmic histogram”. A histogram is a graphical display of data. In this case the shadow, mid and high tones of an image. A logarithm is a quantity or amount. So the logarithmic historgram is a more visual way to see the depth and amount of the low, mid and bright areas of an image.
- I use Colours- levels – and view them via the option at the right – “Logartihmic histogram”. A histogram is a graphical display of data. In this case the shadow, mid and high tones of an image. A logarithm is a quantity or amount. So the logarithmic historgram is a more visual way to see the depth and amount of the low, mid and bright areas of an image.
- I use Colours- levels – and view them via the option at the right – “Logartihmic histogram”. A histogram is a graphical display of data. In this case the shadow, mid and high tones of an image. A logarithm is a quantity or amount. So the logarithmic historgram is a more visual way to see the depth and amount of the low, mid and bright areas of an image.
- Next steps – keep on learning.