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PORead PPM image issues
 

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  1. PORead PPM image issues
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    <p>I've been having tons of trouble getting my algorithm to succesfully read a PPM image... It works perfectly with some images but fails miserably with others, resulting in a half gray (RGB 205, 205, 205) image.</p> <p>I have tried everything I could find and researched for hours. I've been stuck for a week now... </p> <p>I hope you guys can help.</p> <pre><code> Image* pnm_read(char* filePath) { FILE* file; char token[20]; int imageWidth, imageHeight, maximumColorValue; Image* image; /* Abre arquivo PNM. */ file = fopen(filePath, "r"); if (file == NULL) { fprintf(stderr, "Não foi possível localizar o arquivo de imagem %s.\n", filePath); return 0; } /* Lê Magic Number do cabecalho e vê se é P6*/ pnm_get_token(file, token, sizeof token); if (strcmp(token, "P6")) { fprintf(stderr, "%s não é um arquivo PPM válido.\n", filePath); fclose(file); return 0; } //Lê widht, height e valor máximo rgb if (sscanf(pnm_get_token(file, token, sizeof token), "%d", &amp;imageWidth) != 1 || sscanf(pnm_get_token(file, token, sizeof token), "%d", &amp;imageHeight) != 1 || sscanf(pnm_get_token(file, token, sizeof token), "%d", &amp;maximumColorValue) != 1) { fprintf(stderr, "%s não é um arquivo PNM válido.\n", filePath); fclose(file); return 0; } //Se não for RGB com componentes de 8 bits (0-255) dá erro if (maximumColorValue != 255) { fprintf(stderr, "%s does not have 8-bit components: maximumColorValue=%d\n", filePath, maximumColorValue); fclose(file); return 0; } image = new Image(imageWidth, imageHeight); unsigned char* pixelComponents = new unsigned char[imageWidth * imageHeight * 3]; fread(pixelComponents, sizeof(unsigned char), imageWidth * imageHeight * 3, file); fclose(file); int r, g, b, pixel; for(int i = 3; i &lt;= imageWidth * imageHeight * 3; i += 3) { r = pixelComponents[i-3] &amp; 0xff; g = pixelComponents[i-2] &amp; 0xff; b = pixelComponents[i-1] &amp; 0xff; /*fread(&amp;r, sizeof(char), sizeof(char), file); fread(&amp;g, sizeof(char), sizeof(char), file); fread(&amp;b, sizeof(char), sizeof(char), file); r = r &amp; 0xff; g = g &amp; 0xff; b = b &amp; 0xff;*/ pixel = (255 &lt;&lt; 24) | (r &lt;&lt; 16) | (g &lt;&lt; 8) | b; // Atribuindo os pixels e virando imagem de cabeca para baixo image-&gt;pixels[ (imageWidth * imageHeight) - (i/3) - 1] = pixel; } printf("Lido arquivo PNM (%s): %dx%d pixels.\n", filePath, image-&gt;width, image-&gt;height); return image; } </code></pre>
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    1. USuser1422133
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    1. COWhich kind of images does your code fail?
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      1. PORead PPM image issues
      1. USVinícius Gobbo A. de Oliveira
    2. CORandom, downloaded PPM images. But it works (or worked, before I changed it a thousando times to get it working 100%) with at least 1 example I have downloaded here. It works (or worked) with: https://dl.dropboxusercontent.com/u/11352921/exempla1b.ppm It never worked with: https://dl.dropboxusercontent.com/u/11352921/exempla2b.ppm
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      1. PORead PPM image issues
      1. USuser1422133
    3. COCould you post a printscreen and/or the error message? It would help a lot...
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      1. PORead PPM image issues
      1. USVinícius Gobbo A. de Oliveira
 

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