{"id":3676,"date":"2025-08-09T15:22:49","date_gmt":"2025-08-09T14:22:49","guid":{"rendered":"https:\/\/workboot.fr\/ciela\/?page_id=3676"},"modified":"2025-11-02T19:06:46","modified_gmt":"2025-11-02T18:06:46","slug":"images-bitmap","status":"publish","type":"page","link":"https:\/\/workboot.fr\/ciela\/images-bitmap\/","title":{"rendered":"Images Bitmap"},"content":{"rendered":"\n<nav aria-label=\"Table des mati\u00e8res\" class=\"wp-block-table-of-contents\"><ol><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#h.p_dxE6Bu-e-yCx_l\">Pr\u00e9sentation:<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#h.p_DOlu2fulF9tt_l\">pbm , P1 et P4<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#h.p_siyZhGFg_hFp_l\">Le format P1 (pbm ascii)<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#le-format-p4-pbm-binaire\">Le format P4 (pbm binaire)<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#h.p_czEdxHto_7aQ_l\">pgm, P2 et P5<\/a><\/li><li><a class=\"wp-block-table-of-contents__entry\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/#h.p_Tmyu2pcE_qrw_l\">ppm, P3 et P6<\/a><\/li><\/ol><\/nav>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.p_dxE6Bu-e-yCx_l\">Pr\u00e9sentation:<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Bitmap est une repr\u00e9sentation d&rsquo;image. (plan de points)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Le format le plus populaire est le .bmp (bitmap) , qui est malheureusement la propri\u00e9t\u00e9 de (c)microsoft.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Windows_bitmap\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/fr.wikipedia.org\/wiki\/Windows_bitmap<\/a>&nbsp;&nbsp; (bien d\u00e9cris ici)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ce dernier nous autorise malgr\u00e9 tout \u00e0 l&rsquo;utiliser.&nbsp; Il reste un type de fichier un peu lourd et compliqu\u00e9.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">J&rsquo;ai une pr\u00e9f\u00e9rence sur les formats libre pbm, pgm et ppm<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Utilisable par gimp.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">La r\u00e9f\u00e8rence est sur wikip\u00e9edia:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/fr.wikipedia.org\/wiki\/Portable_pixmap\">https:\/\/fr.wikipedia.org\/wiki\/Portable_pixmap<\/a><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">les 3 formats \u00e9tudi\u00e9s:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>pbm<\/strong>&nbsp;,&nbsp; binaire map , Noir&amp;Blanc<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>pgm<\/strong>, nuance de gris.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>ppm<\/strong>, en couleurs 24bits&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P1,P2,P3<\/strong>&nbsp; sont de type ASCII complet. Le # signal un commentaire (dans l\u2019ent\u00eate)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Dans la wiki on nous conseille de ne jamais d\u00e9passer 70 caract\u00e8res par ligne.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>P4,P5,P6<\/strong>&nbsp;seul l\u2019ent\u00eate est ASCII les donn\u00e9es sont stock\u00e9es&nbsp; en bit .. ou octet , appel\u00e9 mode RAW (BRUT)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.p_DOlu2fulF9tt_l\">pbm , P1 et P4<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Noir et Blanc , 1 noir , 0 Blanc<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.p_siyZhGFg_hFp_l\">Le format P1 (pbm ascii)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Exemple de fichier P1: (ASCII total) (le code ASCII n&rsquo;est pas forc\u00e8ment le meilleurs des codages pour une image mais ici p\u00e9dagogiquement parlant ! c&rsquo;est top ! ) , une belle croix (cross)<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/08\/croix.png\"><img loading=\"lazy\" decoding=\"async\" width=\"69\" height=\"71\" src=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/08\/croix.png\" alt=\"\" class=\"wp-image-3684\"\/><\/a><\/figure>\n<\/div>\n\n\n<pre class=\"wp-block-code\"><code>P1\n8 8\n0 0 0 <strong>1 1<\/strong> 0 0 0\n0 0 0 <strong>1 1<\/strong> 0 0 0\n0 0 0 <strong>1 1<\/strong> 0 0 0\n<strong>1 1 1 1 1 1 1 1<\/strong>\n<strong>1 1 1 1 1 1 1 1<\/strong>\n0 0 0 <strong>1 1<\/strong> 0 0 0\n0 0 0 <strong>1 1<\/strong> 0 0 0\n0 0 0 <strong>1 1<\/strong> 0 0 0<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>work@bruno:~\/work\/croix$ hexdump -C croix.pbm \n00000000  50 31 0a 38 20 38 0a 30  20 30 20 30 20 31 20 31  |P1.8 8.0 0 0 1 1|\n00000010  20 30 20 30 20 30 0a 30  20 30 20 30 20 31 20 31  | 0 0 0.0 0 0 1 1|\n*\n00000030  20 30 20 30 20 30 0a 31  20 31 20 31 20 31 20 31  | 0 0 0.1 1 1 1 1|\n00000040  20 31 20 31 20 31 0a 31  20 31 20 31 20 31 20 31  | 1 1 1.1 1 1 1 1|\n00000050  20 31 20 31 20 31 0a 30  20 30 20 30 20 31 20 31  | 1 1 1.0 0 0 1 1|\n00000060  20 30 20 30 20 30 0a 30  20 30 20 30 20 31 20 31  | 0 0 0.0 0 0 1 1|\n*\n00000087<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">On constate que chaque pixel est s\u00e9par\u00e9 d&rsquo;un espace ou un retour a la ligne. (0x20 espace , 0x0a LF , retour \u00e0 la ligne)<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>P1\n8 8\n0\n0\n0\n1\n1\n0\n0\n0\n0\n0\n0\n1\n....etc <\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Comme on ne peut pas d\u00e9passer&nbsp;&nbsp;<strong>70 caract\u00e8res par ligne<\/strong>&nbsp;on&nbsp; va pr\u00e9f\u00e9rer&nbsp; un seul et un  LF (0x0a), retour \u00e0 la ligne, Le fichier sera moins \u00e9ditable mais plus simple \u00e0 g\u00e9n\u00e9rer.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>work@bruno:~\/work\/croix$ hexdump -C croix_lin.pbm \n00000000  50 31 0a 38 20 38 0a 30  0a 30 0a 30 0a 31 0a 31  |P1.8 8.0.0.0.1.1|\n00000010  0a 30 0a 30 0a 30 0a 30  0a 30 0a 30 0a 31 0a 31  |.0.0.0.0.0.0.1.1|\n*\n00000030  0a 30 0a 30 0a 30 0a 31  0a 31 0a 31 0a 31 0a 31  |.0.0.0.1.1.1.1.1|\n00000040  0a 31 0a 31 0a 31 0a 31  0a 31 0a 31 0a 31 0a 31  |.1.1.1.1.1.1.1.1|\n00000050  0a 31 0a 31 0a 31 0a 30  0a 30 0a 30 0a 31 0a 31  |.1.1.1.0.0.0.1.1|\n00000060  0a 30 0a 30 0a 30 0a 30  0a 30 0a 30 0a 31 0a 31  |.0.0.0.0.0.0.1.1|\n*\n00000087<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"le-format-p4-pbm-binaire\">Le format P4 (pbm binaire)<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">on remarque que ce format est bien moins gourmand en m\u00e9moires par rapport au P1 ,  pour un m\u00eame r\u00e9sultat.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>work@bruno:~\/work\/croix$ hexdump -C crx_raw.pbm \n00000000  50 34 0a 38 20 38 0a 18  18 18 ff ff 18 18 18     |P4.8 8.........|\n0000000f<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">L\u2019ent\u00eate est la m\u00eame (P1 devenu P4)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">8 8 , largeur (espace) hauteur , suivi d&rsquo;un retour a la ligne.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Et la les donn\u00e9es ne sont plus \u00e9crites en&nbsp;<strong>ASCII<\/strong>&nbsp;mais on va appeler \u00e7a en&nbsp;<strong>binaire<\/strong>.&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0x18 =&nbsp; 0b00011000&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">0xFF = 0b111111111&nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">On voit que ce format \u00e0 l&rsquo;avantage d&rsquo;\u00eatre moins gourmand en m\u00e9moire .<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>4 -rw-r--r-- 1 work work 135 f\u00e9vr.  4 16:14 croix.pbm\n4 -rw-r--r-- 1 work work  15 f\u00e9vr.  4 16:26 crx_raw.pbm<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Le premier est le P1 (croix.pbm)&nbsp; , et le P4 (crx_raw.pbm)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Attention le format P4 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Un fichier pbm binaire a pour nombre magique P4. Dans les donn\u00e9es binaires de l&rsquo;image, les bits sont regroup\u00e9s par 8 pour former un&nbsp;<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Octet\" target=\"_blank\" rel=\"noreferrer noopener\">octet<\/a>, les bits exc\u00e9dentaires \u00e0 la fin d&rsquo;une ligne sont&nbsp;<strong>ignor\u00e9s<\/strong>.&nbsp;<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.p_czEdxHto_7aQ_l\">pgm, P2 et P5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Nuance de Gris<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tout est dit sur wikipedia sur les formats P2\/5 ( pareil que P1\/4)<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h.p_Tmyu2pcE_qrw_l\">ppm, P3 et P6<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Couleurs RVB<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pareil que P1\/ P4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Tout est dit sur wikipedia sur les formats&nbsp;<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sauvegarde au format P4<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"c\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">int sauve_image_P4(char * titre)\n{\n    int x,y;\n    unsigned char pds;  \/* connaitre le poid su bit *\/\n    unsigned char octet; \/*contient le resultat de l'octet a ecrire *\/\n    octet=0;\n    pds=128;\n    fichier = fopen(titre,\"w\"); \/* on ouvre le fichier en ecriture *\/\n        if (fichier == NULL)\n        {\n            printf(\" Je n'ai pas reussi a ouvrir le fichier \\n\");\n            return(EXIT_FAILURE);  \/*on sort du programme erreur .. d'ouverture *\/\n        }\n    \/* En tete de l image *\/\n        fprintf(fichier,\"P4\\n\"); \/* j'ecris dans le fichier  *\/\n        fprintf(fichier,\"%d %d\\n\",largeur,hauteur);\n        for (y = 0; y &lt; hauteur; y++)\n        {\n            for (x= 0; x &lt; largeur; x++)\n            {\n                if (image[x][y]=='1')  octet =octet + pds;\n                             \/\/fprintf(fichier,\"%c\\n\",image[x][y]);\n                pds=(unsigned char)(pds>>1);\n                if ((pds==0)|| (x==largeur-1))\n                {\n                    fprintf(fichier,\"%c\",octet);\n                    octet=0;\n                    pds=128;\n                }\n            }\n            octet=0;\n            pds=128;\n         }\n        fclose(fichier);  \/* je ferme le fichier *\/\n    return EXIT_SUCCESS;\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Pr\u00e9sentation: Bitmap est une repr\u00e9sentation d&rsquo;image. (plan de points) Le format le plus populaire est le .bmp (bitmap) , qui est malheureusement la propri\u00e9t\u00e9 de (c)microsoft. https:\/\/fr.wikipedia.org\/wiki\/Windows_bitmap&nbsp;&nbsp; (bien d\u00e9cris ici) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_crdt_document":"","_uag_custom_page_level_css":"","footnotes":""},"class_list":["post-3676","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Images Bitmap - workboot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Images Bitmap - workboot\" \/>\n<meta property=\"og:description\" content=\"Pr\u00e9sentation: Bitmap est une repr\u00e9sentation d&rsquo;image. (plan de points) Le format le plus populaire est le .bmp (bitmap) , qui est malheureusement la propri\u00e9t\u00e9 de (c)microsoft. https:\/\/fr.wikipedia.org\/wiki\/Windows_bitmap&nbsp;&nbsp; (bien d\u00e9cris ici) [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/workboot.fr\/ciela\/images-bitmap\/\" \/>\n<meta property=\"og:site_name\" content=\"workboot\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-02T18:06:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/workboot.fr\/ciela\/wp-content\/uploads\/2025\/08\/croix.png\" \/>\n\t<meta property=\"og:image:width\" content=\"69\" \/>\n\t<meta property=\"og:image:height\" content=\"71\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/\",\"name\":\"Images Bitmap - workboot\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/croix.png\",\"datePublished\":\"2025-08-09T14:22:49+00:00\",\"dateModified\":\"2025-11-02T18:06:46+00:00\",\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/images-bitmap\\\/#primaryimage\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/croix.png\",\"contentUrl\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/wp-content\\\/uploads\\\/2025\\\/08\\\/croix.png\",\"width\":69,\"height\":71},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#website\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/\",\"name\":\"workboot\",\"description\":\"Open Source, Open Minds \",\"publisher\":{\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#organization\",\"name\":\"workboot\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/logo_ciel-dorian-1.png\",\"contentUrl\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/wp-content\\\/uploads\\\/2025\\\/05\\\/logo_ciel-dorian-1.png\",\"width\":1024,\"height\":950,\"caption\":\"workboot\"},\"image\":{\"@id\":\"https:\\\/\\\/workboot.fr\\\/ciela\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Images Bitmap - workboot","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/workboot.fr\/ciela\/images-bitmap\/","og_locale":"fr_FR","og_type":"article","og_title":"Images Bitmap - workboot","og_description":"Pr\u00e9sentation: Bitmap est une repr\u00e9sentation d&rsquo;image. 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(plan de points) Le format le plus populaire est le .bmp (bitmap) , qui est malheureusement la propri\u00e9t\u00e9 de (c)microsoft. https:\/\/fr.wikipedia.org\/wiki\/Windows_bitmap&nbsp;&nbsp; (bien d\u00e9cris ici) [&hellip;]","_links":{"self":[{"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/pages\/3676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/comments?post=3676"}],"version-history":[{"count":14,"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/pages\/3676\/revisions"}],"predecessor-version":[{"id":4829,"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/pages\/3676\/revisions\/4829"}],"wp:attachment":[{"href":"https:\/\/workboot.fr\/ciela\/wp-json\/wp\/v2\/media?parent=3676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}