I found this video in a blog last week. If you have been into a scientific conference, "you will not be able to resist the irony of this short video. " Have you experienced presentations like this? Does your presentation look that this? Enjoy.
Sunday, October 23, 2011
Friday, October 21, 2011
In this quick tutorial I show different ways to upscale an image an how to do it using gimp.
Last Wednesday I watched a presentation from Israeli presentation designer Jan Schultink where among other things, he talked about avoiding stretch images. You might know this case. You have a small image and want to make it bigger, so you pull the image handles but the image's proportions are not kept constant.
To re-size an image keeping its proportions constant, press the Shift key and drag the handles.
However you should not up-size an image. As a good practice, always use images that have at least the size height or width of your canvas (typically 1024×768). If you want to size the image in it full size and still it is some pixels short, you can use a black background to make it appear full size.
Sometimes good practices are not real practices and you might yourself forced to use an up-sized image. Something like this (click below to see in original size and see the resulting effect). Sloppy up-sizing can lead to pixelized image.
|Left: Original Image. Right: Upsized image with Keynote|
However, you could do much better if you re-size an with a image manipulating program like Photoshop or GIMP. In GIMP there are 4 different move to scale an image: None. Linear, Cubic, and Sinc. The Figure below shows the different results (Click to see in original size).
|Up-scaling an image in GIMP. From left to right: Original, none, linear, cubic and sinc|
The quality of the re-sizing depends on the image itself. So it is better to test the different interpolation methods. Case in point, take a look at the image below
|Up-scaling an image in GIMP. From left to right: Original, none, linear, cubic and sinc. Source: Flick-r|
My advice is to quicking scale in the image using the all interpolation methods and decide what works better. This brings me to the tutorial.
1. Open the image in GIMP. Recently I discover the opening a image in a layer gives more flexibility.
2. Open the layer Dialog box by pressing Ctrl+L.
3. Duplicate the image 3 times by clicking on o the duplicate layer open (fourth buttom from left to right).
4.0 Select a new layer by clicking on it.
4.1 Open the Scale Layer dialog box. Layer Menu > Scale Layer
4.2. Scale to the require size and choose a different interpolation method.
4.3. (Optional good practice) Double click on the layer and rename to the interpolation method you just applied.
5. Repeat from 4.0 to 4.3 until you have applied all the interpolation methods.
6. On the layer dialog press and hold the Shift key and click on the eye an layer to close the others. Move through the all the layers and decide what works better.
Sunday, October 16, 2011
The saying goes that the devil is in the detail, and in scientific presentations is this certainly the case. Sadly, all too often students, researchers and professors run over their audiences with too much detail. If everything is important, then nothing is important. If you provide too much detail, you will decrease the contrast of your talk, making it monotonous, losing your main point. Short presentations, that is, 20 minute talks plus Q&A should be about --what I call-- vision: one solid point supported by two, maximum three arguments. Leave the detail for the report, article or even a book.
Clarity, not detail should characterized short talks. If you suspect your are giving too much detail, chances are you have not defined your core message. In this case, you need to review who is your audience and why is it they are coming to see you. The fact that you know your material so well does not imply that you have to tell the audience everything you know about it. Leave them craving for you. In you provide a crisp vision they will ask you for more. This is not to say that you should not know your material. On the contrary, mastering your material is essential to clear your core message from the unnecessary details.
|Left: Clear contrast between your vision and the surroundings. Right: Tough to differentiate details from the surroundings|