in addition (as recommended by someone else on here), i had loaded a palette from a copy of ness’s original unedited sprite before saving my hacked version as a png in ness’s sprite number.Ĭoilsnake loaded fine and spitted out a rom without error, but when i played the game i noticed my sprite had lost its transparency around particularly my edited sprites and had corrupted the palette of all the other sprites in the file. i then swapped from index to rgb and back to indexed colors.i recently tried editing the ness spriteset in photoshop, which (even after switching from rgb to index) when coilsnake spit out an error for an incorrect palette, i threw into a different sprite program (recommended from a post on here, don’t know where) called “aseprite”.im kind of a noob and dont know if i can fix this problem i got, so i wanted to see if anyone else knew what went wrong here ImageData.data = 127 //opacity = 0.5 Ĭ.Howdy. Var ImageData = c.getImageData(0,0,img.width,img.height) The code making image half-transparent: var canvas = document.getElementById('m圜anvas') Where x is the horizontal offset, y is the vertical offset. So to get red green blue and alpha values, we'll do the following: var r = imageData.data Where context is your canvas 2d context, and x and y are the position on the canvas. The putImageData syntax: context.putImageData(myImageData, x, y) use source-over and fill it with white color with alpha at 0.13, then fade to prepare the canvas). Its not 100 perfect, sometimes it leaves some traces but it could be tweaked, depending whats needed (i.e. GetImageData usage: var myImageData = context.getImageData(left, top, width, height) Transparent canvas can be quickly faded by using destination-out global composite operation. The sprite color mode The color profile And the transparent color (only in indexed images) Along with this, there are two active colors that can be used to paint or erase parts of the sprite: The active Foreground Color The active Background Color Color Mode Several adjustments and commands work differently depending on the active color mode. To manipulate pixels we'll use two functions here - getImageData and putImageData. You can directly manipulate pixel data in canvases at the byte level This suggestion is based on pixel manipulation in canvas 2d context. If you want to achieve a fading effect over time you need some kind of loop that changes the alpha value, this is fairly easy, one way to achieve it is the setTimeout function, look that up to create a loop from which you alter the alpha over time. I wonder if there is some kind third way of setting color so that we can tint images and make them transparent easily.Īfter further digging I have concluded that you can set the transparency of an image by setting the globalAlpha parameter BEFORE you draw the image: //works with images works with imagesĬtx.globalCompositeOperation = "lighter" I have concluded that setting the globalCompositeOperation works with images. works with shapes but not with imagesĬtx.fillStyle = "rgba(255, 255, 255, 0.5)" When using the eraser tool and right-clicking to erase specific colours, if you're trying to erase a colour into the transparent colour, it doesn't work. As far as I have concluded right now, this does not seem to affect image drawing. I am also looking for an answer to this question, (to clarify, I want to be able to draw an image with user defined opacity such as how you can draw shapes with opacity) if you draw with primitive shapes you can set fill and stroke color with alpha to define the transparency.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |