I'm trying to "load" some 2d image as a material for a mesh, (I know about spritemanager) but I'm unfortunately getting this sprite with it's white background. How can I "make it go"(the background)?
Thanks.
If the image is of a file type that supports transparency, open it up in image editing software (paint.net, photoshop, etc.) and delete the white or replace it with empty/transparent color.
Otherwise, look for an option in the unity documentation to set a specific color value as 'background' or 'transparent' so that that color will be ignored.
First of all, you need to add an alpha channel to your texture and save it in a format that supports alpha channel transparency.
Here is a quick tutorial on how to do this in GIMP:
Note that you can remove the selected background with the Delete-key.
In my case, I'm exporting the result as a PNG for alpha transparency support. You can do this from the export menu by renaming the file suffix to .png:
I use these settings to export my PNG:
Then, after importing the image into Unity, Make sure that in the texture's import settings the image's alpha source is set to Input Texture Alpha and that Alpha is Transparency tickbox is checked like so:
Finally, since you are using this on a mesh, you need to ensure that your mesh has a material applied that has it's render mode set to Cutout:
Hope this little guide helps.
Related
So I am new to this next-gen Flash application they call "Adobe Animate CC" and I am trying to create an interactive map scene... very basic. If you click on the USA it should zoom in. Click again it should zoom out.
The issue I am having is that even though my map was imported from an SVG file -- and from what I can tell when residing in the "Adobe Animate CC" workspace it retains its vector data -- when I apply the scale tween using CreateJS the edges of the graphic become very pixelated.
Here's the code I am using:
var _this = this;
_this.stop();
_this.america.addEventListener("click", zoomMap);
function zoomMap(event) {
createjs.Tween.get(exportRoot.world1).to({scaleX: 10, scaleY: 10, x: 4000, y: 1000}, 1000);
}
And here are some images of the pixelated result:
Even more disconcerting is that that blue-green circle is a native circle object inside a symbol. Not an svg. I would expect that at least that would stay crisp under transformation.
Is this unavoidable? Is the application caching bitmap versions of my vector files on export? Can I stop this? Can I force a re-render of the vector file during and after my tween? Is there any way around this? Does this application even really support vector graphics?
Animate might be exporting as images, but it shouldn't unless you tell it to. What does your library JavaScript look like? Are any images exported? Maybe search the source for .cache to see if Adobe is doing anything funny under the hood.
If the map is an SVG source: Unfortunately, only the only SVG support in EaselJS (which underlays the Animate export) is for svg as a "bitmap source". This means it is being treated as an image of a specific dimensions, and scaling it past "100%" will interpolate the details.
It might be possible to load it as a larger bitmap, and scale it down to start, but that will:
make it much larger in memory
still only let you scale so much
Another option is to import the SVG asset into Adobe Animate, which should convert it to a vector graphic. If it is vector in EaselJS, you can scale it as much as you want, because it uses Canvas vector APIs to draw, instead of an image source.
You mentioned that the green circle is native (I assume a shape in Animate?). Are you sure its not being exported as an image, instead of a shape? Are you caching anything?
Hope that helps!
I have no experience on any image processing/editing tool. And I am doing a project, which requires me to use different shapes. I could create different shapes using visio. But however not able to get rid of white background behind. I need only shape not squared white background.Tried online out of my ways but not successfull.
Any help will be greatly appreciated.
Thanks,
Ganesh
Absolutely any image file has to be contained within a rectangular frame, this includes png and SVG.
Some image file formats can have what are called alpha channel backgrounds this allows you to see through transparent areas.
What you want to do is remove the white background to expose the alpha channel background in Photoshop (or similar tool) which can then be saved out as transparent.
For example in Photoshop:
If you open this image directly and have no other layers, double click the layer that says background and OK the confirmation box. This turns your flat image into a layered image
Select the magic wand tool and ensure you have a high tolerance set (3)
with the wand selected click the white area to bring up a marquee around your selection (the white background) and hit delete to remove it.
Your image should now have a chequered background which is the transparency showing through.
If you now go to file > save as and select png, your image should now be saved out with an alpha background.
Please note: There are further optimisations to make if this is for web, including file formats and file size but that is beyond the scope of this question but I encourage you to read up on the Gif format and it's restrictions, the difference between 8bit and 24bit pngs and how to use SVG.
You can do it pretty simply at the command-line using ImageMagick which is free and installed on most Linux distros and is available for OSX and Windows.
Basically, you want to make your whites transparent, so you would do
convert shape.png -transparent white result.png
If your whites are a little bit off-white, you could allow for some variation with a little fuzz as follows:
convert shape.png -fuzz 10% -transparent white result.png
I added the checkerboard background just so you can see it on StackOverflow's white background - it is not really there.
By the way, you may like to trim to the smallest bounding rectangle while you are there:
convert shape.png -fuzz 10% -transparent white -trim result.png
By the way, you can also draw your shapes with ImageMagick:
convert -size 150x150 xc: -fill none -stroke "rgb(74,135,203)" -draw 'stroke-width 90 ellipse 0,0 80,80 30,80' arc.png
See Anthony Thyssen's excellent examples here.
As you can see here the screenshot in photoshop:
After I save it for web, using PNG-24 format this is how it looks like on my website:
Why isn't the image opacity working on my browser? Using firefox.
Actual PNG :
I'm not really sure what your desired effect is, but I think that you want the gradient to disappear at the bottom. With that assumption, the problem with your gradient is that it fades from your brown color at the top to white at the bottom.
Your gradient looks something like this:
You want to change the color on both sides of the gradient to be the same brown color, then reduce the opacity of the right-hand side to 0%, like this:
I've adjusted it for you already, so here it is:
It doesn't look any different on a white background, but when it is on another color or texture you'll see the difference.
Does your Photoshop layer have some effected added to it? I.e multiply etc. That would mean the layer is dependant and effected by what is below it.
I face same kind of problem long years ago. when we save our file or image for web. it should be save as web & when we save in PNG format make sure that all background layers off. then just save as web & select PNG(24) from setting option.
& Yes Make sure that where you past the image in web must have CSS in the tag.
background-color:none;
I have been looking for the solution on the web for a long time. Most tutorials are fairly simple about adding shadow to a UIView. I also noticed that if we add a shadow to an UIImageView. The shadow shape could perfectly fit the shape of the content image if the image itself has alpha channel in it. Say for example, if the image is an animal with transparent background, the shadow shape is also the same as that animal (not a rectangle shadow as same as UIImageView frame).
But these are not enough. What I need to do is to add some changes to the shadow so it may have some rotation angle and compressed (squeezed or shift) effect so that looks like the sunlight comes from a certain spot.
To demonstrate what I need, I upload 2 images below, which I captured from the Google Map App created by Apple. You can imagine the Annotation Pin is an image which has the Pin shape, so the shadow is also "pin shaped", but it is not simply "offset" with a CGSize, you can see the top of the shadow is shifted right about 35 degrees and slightly squeezed the height.
When we tap and hold and pin, the shadow is also animated away from the pin, so I believe that such shadow can be made programmably.
The best shadow tutorial I can found so far is http://nachbaur.com/blog/fun-shadow-effects-using-custom-calayer-shadowpaths But unfortunately, that cannot make this effect.
If anyone know the answer or know any better words to search for, please let me know. Thank you.
(Please note that the shape of the image is dynamic in the App, so using any tool like Photoshop to pre-render the shadow is not an option.)
In order to create dynamic effects like this, you have to use Core Graphics. It's incredibly powerful once you know how to use it. Basically you need to set a skew transform on the context, set up a shadow and draw the image. You will probably have to use transparency layers as well.
It doesn't sound like you can use CALayer shadows, since that is meant to solve a specific use-case. The approach Apple takes with the pin marks on the map is to have two separate images that are created ahead of time (e.g. in Photoshop) and they position them within the map relative to a reference point.
If you really do need to do this at run-time, it should still be possible by using either Core Graphics or ImageKit. To get a blurred shadow appearance, you can use the kCICategoryBlur CIFilter. You can then convert the image to grayscale. And to get that compressed look you just need to resize and skew the image.
Once you have two separate images, you can either take the CGImageRef for the shadow image and can set that as the content of another sublayer, or you can add it as a separate view.
If you know what all the shapes are, you could just render a shadow image in Photoshop or something.
In Photoshop you can set a layer's blending mode to be "Hue". If that layer is, for example, filled with blue then it seems to take the layer below and makes it all blue wherever a non-whiteish color exists.
I'm wondering what it's actually doing though. If I have a background layer with a pixel aarrggbb and the layer on top of that is set to blend mode "Hue" and there's a pixel aarrggbb on that layer, how are those two values combined to give the result that we see?
It doesn't just drop the rrggbb from the layer below. If it did that it'd color white and black as well. It also wouldn't allow color variations through.
If a background pixel is 0xff00ff00 and the corresponding hue layer pixel is 0xff0000ff then I'm assuming the end result will just be 0xff0000ff because the ff blue replaces the ff green. But, if the background pixel is 0x55112233 and the hue layer pixel is 0xff0000ff, how does it come up with the shade of blue that it comes up with?
The reason I ask is that I'd like to take various images and change the hue of the image programmatically in my app. Rather than storing 8 different versions of the same image with different colors, I'd like to store one image and color it as needed.
I've been researching a way to replicate that blending mode in javascript/canvas but I've only come up with the "colorize" filter/blend mode. (Examples below)
Colorize algorithm:
convert the colors from RGB to HSL;
change the Hue value to the wanted one (in my case 172⁰ or 0.477);
revert the update HSL to RGB
Note: this is ok on the desktop but it's noticeably slow on a smartphone, I found.
You can see the difference by comparing these three images. Original:
colorize:
Fireworks' "blend hue" algorithm (which I think is the same as Photoshop's):
The colorize filter might be a good substitute.
RGB/HSL conversion question
Hue/Chroma and HSL on Wikipedia
I found an algorithm to convert RGB to HSV here:
http://www.cs.rit.edu/~ncs/color/t_convert.html
Of course, at the bottom of that page it mentions that the Java Color object already has methods for converting between RGB and HSV, so I just used that.