ppm

问题 EDIT: Actually, I need a way I can read the lines and extract the pixel info into some structure so I can use the putpixel function to create an image based on the ppm p3 file. I've been trying this for so long and I can't just get it right. I'm working with Python Imaging Library (PIL) and I want to open a PPM image and display it as an image on the screen. How can I do that using only PIL? this is my ppm image. it's just a 7x1 image that i created. P3 # size 7x1 7 1 255 0 0 0 201 24 24 24

问题 EDIT: Actually, I need a way I can read the lines and extract the pixel info into some structure so I can use the putpixel function to create an image based on the ppm p3 file. I've been trying this for so long and I can't just get it right. I'm working with Python Imaging Library (PIL) and I want to open a PPM image and display it as an image on the screen. How can I do that using only PIL? this is my ppm image. it's just a 7x1 image that i created. P3 # size 7x1 7 1 255 0 0 0 201 24 24 24

问题 hey I need a little help with my code, I read a ppm file, change the colors to black and white and want to save it to a new file. I could read the header of my file and write it to the new file but I've struggles with changing the colors. I know that I can get the grey value with the formula: 0.299 * red component + 0.587 * green component + 0.114 * blue component. Does anyone know how I can write this as a code? int main(int argc, char **argv) { FILE *oldFile, *newFile; int width, height,

问题 I am struggling to pixelate an image which is made up of RGB values stored in a binary (P6) PPM file. The steps to pixelate the image are as follows: Read in the binary data and store it in a 1-dimensional array Iterate through the data stored in this array, in cells of size 'c' (row x columns). This variable 'c' can be changed by the user, but for this program it's currently set to int c = 4; meaning it iterates through pixel data in block dimensions of 4 x 4 Now find the average colour

问题 I am struggling to pixelate an image which is made up of RGB values stored in a binary (P6) PPM file. The steps to pixelate the image are as follows: Read in the binary data and store it in a 1-dimensional array Iterate through the data stored in this array, in cells of size 'c' (row x columns). This variable 'c' can be changed by the user, but for this program it's currently set to int c = 4; meaning it iterates through pixel data in block dimensions of 4 x 4 Now find the average colour

问题 I am working on a similar dataset as the chorley dataset in the spatstat package and am following a similar analysis as presented in the sample book chapter, Spatial Point Patterns: Methodology and Applications with R. https://book.spatstat.org/sample-chapters/chapter09.pdf library(spatstat) data("chorley") X <- split(chorley)$larynx D <- split(chorley)$lung Q <- quadscheme.logi(X,D) fit <- ppm(Q ~ x + y) locations = data.frame(x=chorley$x, y=chorley$y) pred <- predict(fit, locations =

问题 I am working on a similar dataset as the chorley dataset in the spatstat package and am following a similar analysis as presented in the sample book chapter, Spatial Point Patterns: Methodology and Applications with R. https://book.spatstat.org/sample-chapters/chapter09.pdf library(spatstat) data("chorley") X <- split(chorley)$larynx D <- split(chorley)$lung Q <- quadscheme.logi(X,D) fit <- ppm(Q ~ x + y) locations = data.frame(x=chorley$x, y=chorley$y) pred <- predict(fit, locations =

问题 I'm writing a program that takes in two duplicate PNM P6 files, puts the memory of the first file into a buffer, creates a yellow diagonal line over that, and writes the result to the second file. When I run it, the output file is corrupted and can't be displayed. I noticed when looking at the output that it's missing the three lines that should be at the top: P6 1786 1344 255 I don't know how to programmatically ensure that those lines stay in the code -- I can't figure out why they're even

问题 I am trying to convert RGB frames (ppm format) to YUV420P format using ffmpeg. To make sure that my code C++ is good , I compared the output with the one created by this command (the same filer BILINEAR): ffmpeg -start_number 1 -i data/test512x512%d.ppm -sws_flags 'bilinear' -pix_fmt yuv420p data/test-yuv420p.yuv My code : static unsigned char *readPPM(int i) { FILE *pF; unsigned char *imgRGB; unsigned char *imgBGR; int w,h; int c; int bit; char buff[16]; char *filename; asprintf(&filename,

问题 How exactly does GIMP convert a jpg into a ppm? I'm trying to convert a jpg to a ppm on Android. In Android I use the API to create an ARGB_8888 Bitmap of the jpg then drop the Alpha channel and throw the RGB values into a ppm. But I get different values for RGB from GIMP. 回答1: Have a look into the code. You can find it here: http://git.gnome.org/browse/gimp/tree/plug-ins/common/file-pnm.c 来源： https://stackoverflow.com/questions/4908635/android-gimp-jpg-to-ppm-conversion