i need convert to Black this image.
need to convert image totally dark for simulate a shadow.
"not black and white process. need totally dark"
example
before converte image totally black
how to stretch in horizzontal type this image?
Related
How can I create a bitmap that looks something like this?
Rectangle picture. Bottom is for dark colors. Top is for bright colors. Colors are changing from left to right.
I need to create my own color spectrum bitmap because (external)image files are often compressed and not showing the correct colors in particular pixels.
Given the following image:
I need to output this image:
I want to increase the size of Black Pixels in the image using C# or AForge.Net
The image processing operation you need is morphological dilation or, in your case with black dots on white background morphological erosion.
I have a .png image, i want to get the points that the shape is made of.
Example:
I know that i won't get a perfect output but anything would be good..
How should I start?
I would need to get a list of points out of my image.
Very simple. Replace an NON white pixels by black. Then loop in each black pixel and turn them white if not adjacent to at least 1 white pixel.
I've written a photo viewer, and I want to superimpose text over the photo. I want the font or font color to make the text as legible as possible on top of the bitmap, no matter what the underlying bitmap looks like.
My current thinking is to take the region of the bitmap where the text will appear, and make some kind of "overall color" calculation for that area, and then set the font color to be something correspondingly contrasting.
However, this math is way over my head. Has anybody seen a method for making this type of "what's the average color of all of these pixels" calculation? Or is that not even the best approach?
EDIT: I'm moving the second portion of this to another question.
You can use this to calculate average color of a region of bitmap:
How to calculate the average rgb color values of a bitmap
Do you store your image as a Bitmap?
You can also draw an outlined text. For example, white text with black outline. This will make text visible on most of backgrounds:
How to Drawing Text with Outline onto Images?
The title looks a bit weird, so here is a sample:
You will probably be familiar with the Windows 7 Explorer.
When you select something with the pressed left mouse button, you get a blue half transparent rectangle.
So the question is now:
It is possible to calculate the source RGBA color that was used to draw this rectangle?
The only things I know is the RGB value from the background and the RGB value with the blue overlay. Here is a screenshot from what I mean:
No, it ist not possible from a single image.
You need the target data over a black and a white image (best case).
After that, you need to use the first forumular in this article:
http://en.wikipedia.org/wiki/Alpha_compositing