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Closed 10 years ago.
Possible Duplicate:
Change Backlight Brightness on iPhone Programmatically
How can i adjust brightness in my application in xcode 4 with a UISlider? I can't find any modern code on how to access it.
There is no public API to reduce overall screen's brightness as found under Brightness setting. However if your intent is to just reduce the brightness of you app, you can change the opacity of the view.
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Enlarge image pixels with opencv
(2 answers)
Closed 2 years ago.
I have an image that is 8x8px, and i need it to be 16x16, but I want it too look the exact same. So I want every pixel in the 8x8 version to be 4 pixels, making it 16x16. Is there a way to do this?
I want every pixel in the 8x8 version to be 4 pixels, making it 16x16.
What you are describing is commonly called "nearest neighbor" resampling. Most image editing software has an option for this.
One way to do factor-2 nearest neighbor upscaling is to use the ImageMagick convert command line program like:
convert in8x8.png -scale 200% out16x16.png
Or if you have MATLAB and the Image Processing Toolbox, you can do it with imresize as imresize(I, 2, 'nearest').
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How to generate a non-linear colormap/colorbar?
(4 answers)
Closed 7 years ago.
Im displaying a 3D matrix, as an image using the surf tool in a 2D display as follows:
figure;
title('Plot')
surf(Matrix,'EdgeColor','None');
view(2);
colorbar;
There are areas of the image that i am interested in distinguishing from other areas, however since there are a few very high/ very low background values, the image doesn't make the colour of the interesting areas distinct, since the colour bar has to take into account the whole spread of the values.
Is there a way to change the colour bar so it takes the average values more into account as apposed the extreme values?
You can use caxis option to tune your color limits, and prctile to get the percentile level. Combining them will let you highlight portions of you data.
e.g.
caxis(prctile(Matrix(:),[5 90]))
will limit the colormap to the data above the %5 and below %90. Modify this values at will
I have a direct3d9 application which can render camera output onto a window. What are the things I should consider to improve the rendering video quality in direct3d 9 ?
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Gradient borders
(20 answers)
Closed 3 years ago.
Here's a screenshot of my existing image-based vertical divider for menu items (hopefully you can see it):
(1) What's the best way to replace this image with a custom CSS3 style? Dimensions are 3x27.
(2) Does Compass offer a mixin for vertical dividers? That would be preferable, and if so, no need to address (1).
I am not sure if compass has something for this but couldn't you use regular css borders. border-right:1px solid white then on the last one say dont have a border.
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How to maintain widgets aspect ratio in Qt?
(5 answers)
Closed 1 year ago.
I'm using Ruby Qt bindings.
I'm trying to make a square widget (checker board), but it doesn't seem to work.
This is the code that I tried
What is the proper way to making a widget that maintains its aspect ratio?
See this question: How to maintain widget's aspect ratio in Qt?