GIMP :: Disable Anti-aliasing When Using Colour To Alpha
Jun 29, 2013
I wish to impose an image on to another. a foreground image onto a background image. Hence for the foreground image I need the background (of the front image) to be transparent (alpha) which Ive done following this tutorial: [URL] .....
Note: the back colour is pure white (#FFFFFF)
However the issue arises that one of the people in the image is wearing a light blue shirt, hence when i follow the tutorial, it makes his shirt semi-transparent.
After much looking around i found this in the docs: [URL] ........
Which states: "It will attempt to preserve anti-aliasing information by using a partially intelligent routine that replaces weak color information with weak alpha information. In this way, areas that contain an element of the selected color will maintain a blended appearance with their surrounding pixels. "
However I dont want this, what i wish to happen is that anything is pure white is changed to alpha, and anything NOT pure white is left as is.
Hence it my understanding through the document quote above, the solution is to disable this ant-aliasing function as described in the quote
and I would like to get a gradient border on it (something like two pixels would be perfect) from the green sine to black. (Partial transparancy would be nicer but since .gif doesn't support that...and yes I do need it to be a .gif XD)
Problem is...that I can't get any of the filter options to work, they are all disabled. After some tests I noticed that this is because there's an alpha layer that for some reason disables the filters.
So...how to get a gradient (green to black) border on the sine?
I used gimp 2.6 for awhile just to do simple isolations for various projects.
Recently my gimp 2.6 crashes while trying to load gradients, so i upgraded to 2.8 and all of the brushes that were in 2.6 are gone and NONE of them have anti-aliasing edges so i can isolate things with fuzzy alpha edges.
how to turn this back on or create a brush that has anti-aliasing edges?
I have a selection, make "Edit -> Stroke Selection" -> 4px and Anti-Aliasing is checked, but the stroked line is NOT Anti-Aliased. When I chose an even Line Width like 6 or 8 the Line is Anti-Aliased.
Why there is no Anti-Aliasing for odd Line Widths? Is this a Bug or do I miss something?
As shown in the screen caps below, I have a simple Selection and I filled it with the Paint Bucket tool. However....now the many curved edges of the selection (it was cursive writing) are now EXTREMELY aliased and almost Tron-like in their appearance.
So, is it possible (please say yes!) to fill a selection with anti-aliasing in GIMP, and if so, how do you achieve this?
I've created a panel using the rounded rectangle method.
My panel is transparent on the background and I don't like how the edges of it are shown (too rough). I want to add semi transparent pixels after them (a kind of manual anti-aliasing)
I want to cut a gradient with hard edges. But gimp is anti aliasing and color blending the edges with every tools. Same happens on filling the selected area, or erasing, or deleting.
See here. The upper is the original before filling with white/deleting the selected are, the lower is the result. The edges are blended, but i don't want it to be blended!
I am trying to to use Colour to Alpha by picking a specific colour from an image. But I can't get the colour picker to work.
The image has an alpha channel.
I choose Colour to Alpha, then click on the From swatch. The Colour to Alpha Colour Picker window appears. I click on the eyedropper. But when I move the eyedropper over the image, the cursor changes to the previous tool that was used. For example, if I used the zoom tool, the eyedropper changes to zoom as the cursor leaves the Colour to Alpha Colour Picker window, and zoom becomes active.
I scanned some text hand-written with a magic marker. i use threshold to get the artwork plain black and white, select the white with the magic wand, select similar and then delete. i'm left with the solid black image with crisp edges. i have marquee tools, lasso tools, and magic wand set to anti-aliasing off. feather i set to 0.
when i rotate the image to make it level, the image gets anti-aliased. to try to correct that i select the pixels of the image with command click on the layer, delete that layer and make a new layer. then i just have shape of the image created by the selection tool. when i use fill to try to fill it in, the image is anti-aliased. all i want to do is fiil in exactly inside the shape that i have selected.
The Text tool has options for anti-aliasing - Strong, Crisp, etc. Is there anything similar when filling paths?
I am filling two paths with a common edge; when the Anti-alias box is un-checked, the border looks ragged, but when the box is checked, the border looks grey. I can get the results I want by filling twice with anti-aliasing turned on, but I would like to have the box "Half-checked".
Photoshop worked completely fine until four days ago; now whenever I try to write text it is jagged and not anti-aliased in vector form or once rasterised.
I've just set up CS4 and my brushes are not anti aliasing properly. There are no soft edges on any of them. I'm able to get a pressure sensitive opacity change on the stroke but the edges are all pixelated.
Here is an image (this is a soft brush. notice none of the feathering/anti aliasing is there): ...
I am trying to transform a sprite which is about 32x32 and while using Photoshop's free transform tool to size it to something like 600x600 it becomes horribly distorted (thanks to the anti-aliasing). I need to turn it off while transforming, yet I see no option.
I'm looking for a way to do some anti-aliasing on my drawing. I have a drawing that I scanned in and I cut out a few components of my scan in MS Paint. I did this by drawing the outline manually in one color and then coloring the background with that same color and then copying it with that color as the see-through color. The problem is that the contours look terrible on a black background since MS Paint can't help with anti-aliasing. Instead, I've got these cut-out drawings of objects with a thin white glow around them. That is, when I cut them out, it was extremely hard to move along the lines EXACTLY. I tended to cut more outside the lines than in, and so I took a lot of the white background with it. I need a way in PhotoShop to get rid of those white lines and then do some better anti-aliasing. How can I do this?
I'm copying some vector art (monochromatic flats) from Illustrator and pasting into Photoshop as Smart Object. I am making selections from the flats to create individual paths to color however the edges aren't lining up. I end up with gaps between the edges and the lines are jagged.
Can someone please explain anti-aliasing? I am following a few video tutorials, one is saying turn it on and the other says to turn it off.
Whenever I try to use the 'Colour to Alpha' tool, while it works on most of the image, I always get little white dots left behind, and have to spend ages use the eraser tool to get rid of them.
In the above picture you can see alternate options under text aliasing called Windows LCD. These only became visible to me after removing a GPU and all drivers, but with a new GPU it is still present?
My question is, how do you get this aliasing option as a default?
Here at work we have recently upgraded from CorelDRAW 12 to X5. While this has come with plenty of great benefits (able to open newer versions of AI files), it seems some things are still present (stability issues). I actually work on a Mac at home for my freelance stuff so maybe I'm just used to the reliability that comes with a Mac. I enjoy PCs too but with years of experience with both I'd be lying if I said PCs are on par with what Apple brings to the table. Especially when it comes to graphic design work.
So this brings me to the problem of spot color anti-aliasing in the enhanced view of X5. The first two pictures below show how CorelDRAW 12 handled spot colors. These are direct SCREENSHOTS that I cropped in Photoshop, not exports. And I did no extra editing.
There is basically no difference between how the Pantone colors display on screen and how the RGB colors display. Which is great and what you'd expect, right?
However, let us step into X5 for a minute with the exact same colors, using the exact same palette.
Obviously there is a difference here. For some reason X5 has decided to anti-alias the Pantone colors in some weird way so that I get a tiny white outline (no the shapes don't have outlines). And if you look closely at the smaller purple box at the bottom you will see that even when I use the exact same pantone color from the exact same palette but with one color named differently, I get the white outline. The smaller box's color within is named '276 CV' while the outer box's color is named 'PANTONE 276 CV'.
How does simply naming a color effect how it displays on screen? Seems like a bug/glitch to me.
I know what is trying to be done here but why take a step backwards from CorelDRAW 12. I have a hard time using CorelDRAW as it is but as a graphic designer I need to know how something is going to look on screen without this unnecessary anti-aliasing going on.
So my questions are:
1.) Why does this do this in X5 but not 12? 2.) How to maybe turn it off? (I know I can view it in Normal view mode and the colors are fine but then my text is screwed up).
When I create a rectangle shape the edge is blured slightly with one pixel of color. How do I make sure the rectangle is sharp? I cannot find the option to click off anti-aliasing on the option bar in CS4, anyone know where it went?
Is there a way to draw a shape WITHOUT anti-aliasing? It doesn't have the option like all the other tools. I've wondered this for years but never bothered asking anyone.
i have an image that i can select with the Magic Wand Tool (W). Only problem is the image is kinda jagged around the edges... my question is, how do I make the edges smooth?
I hope you understand what I mean but, when I make a selection and fill it the edges are not antialiased, it's really annyoing and I can't figure out how to get smooth edges.
Do draw a simple curved line: pen tool, then stroke with a brush, correct?
- line on left is stroked with a brush 2px max hardness
- middle line is stroked with pencil 2px, no anti aliasing (no option either?)
- arrow on right is what I'm aiming for! smooth, but not blurred, its the same thickness as the others.
Now, I actually drew the arrow, but can't remember how - do you see what I mean? There should be a happy meduim between the left and right curves, to get the arrow. I can't find it! the anti aliasing is still heavy, even on max brush hardness, and the pencil is too far the other way.
Is there a way (plugin and or method) to rotate/zoom a layer without anti aliasing being applied?I'm working with sprites and anti aliasing is a pain to remove.
