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问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 For my pygame project, I must detect collision betweeen various .png image that move on the screen. I have put the image inside sprite, and the sprite inside group, then I use this : pygame.sprite.spritecollide(perso, zombie_group, False) However, sometime, my image don't touch, but pygame detect a collision... This is due to the fact that my images are png with transparent borders. The transparent border collide, and pygame detect this :( Any idea to stop the transparent border from

问题 I am trying to create new empty image with width and height and save it as png to file. This is what i got: var myImage = new Image(200, 200); myImage.src = 'picture.png'; window.URL = window.webkitURL || window.URL; var contentType = 'image/png'; var pngFile = new Blob([myImage], {type: contentType}); var a = document.createElement('a'); a.download = 'my.png'; a.href = window.URL.createObjectURL(pngFile); a.textContent = 'Download PNG'; a.dataset.downloadurl = [contentType, a.download, a

问题 I need to split a webm encoded video into png frames, without losing transparency. I use the following ffmpeg command: ffmpeg -i dancer1.webm -pix_fmt rgba frames/%04d.png This produces a directory of pngs, but why is each output frame is missing transparency? I have used this example video, which contains an alpha channel. See it playing over a background here. Here's an example output frame from ffmpeg: ffmpeg produces the following output when it runs: ffmpeg version N-60294-g549f052

问题 I need to split a webm encoded video into png frames, without losing transparency. I use the following ffmpeg command: ffmpeg -i dancer1.webm -pix_fmt rgba frames/%04d.png This produces a directory of pngs, but why is each output frame is missing transparency? I have used this example video, which contains an alpha channel. See it playing over a background here. Here's an example output frame from ffmpeg: ffmpeg produces the following output when it runs: ffmpeg version N-60294-g549f052

问题 I have an A4 png image with some text in it, it's transparent, my question is, how can I crop the image to only have the text, I am aware of cropping in PIL, but if I set it to fixed values, it will not be able to crop another image that has that text in another place. So, how can I do it so it finds where the text, sticker, or any other thing is placed on that big and empty image, and crop it so the thing fits perfectly? Thanks in advance! 回答1: You can do this by extracting the alpha channel

问题 This question already has an answer here : ggplot's qplot does not execute on sourcing (1 answer) Closed 7 years ago . The following code produces an image: library(latticeExtra) x=runif(40) y=runif(40) z=runif(40) png(filename=paste(i,".png",sep="")) levelplot(z ~ x + y, panel = panel.levelplot.points, col.regions = rainbow(50)) dev.off() But the following code does not. Why? library(latticeExtra) for(i in seq(1,5)) { x=runif(40) y=runif(40) z=runif(40) png(filename=paste(i,".png",sep=""))

问题 This question already has an answer here : ggplot's qplot does not execute on sourcing (1 answer) Closed 7 years ago . The following code produces an image: library(latticeExtra) x=runif(40) y=runif(40) z=runif(40) png(filename=paste(i,".png",sep="")) levelplot(z ~ x + y, panel = panel.levelplot.points, col.regions = rainbow(50)) dev.off() But the following code does not. Why? library(latticeExtra) for(i in seq(1,5)) { x=runif(40) y=runif(40) z=runif(40) png(filename=paste(i,".png",sep=""))

问题 This question already has answers here : Change color of PNG image via CSS? (16 answers) Closed 9 months ago . I have an icon in a webpage: <div class='icon-container'> <img src = "img/gavel3.png" class="gavel-icon" style='vertical-align:center;width:80px;'> </div> I'm trying to replace the black in this image with the color: #2a4f6c using CSS only. I tried to replace the black with this color using Photoshop, and it looks awful and grainy. Is a solution possible using pure CSS? Image in