You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Reload to refresh your session. You switched accounts on another tab or window. Reload to refresh your session. Dismiss alert
å æ¥ iPhone ã§æ®ã£ãåçã Mac ã«åãè¾¼ãã§å å·¥ãããã¨ããããæ¡å¼µåã .heic ã¨ããè¦æ £ããªããã®ã§ããã ãµã¤ãºãå¦ã«å°ããã®ã§ãªããããããã¨æã£ããã iOS 11 㨠macOS High Sierra ãã対å¿ããæ°ããã¡ãã£ã¢ãã©ã¼ãããã¨ã®ãã¨ã Apple 製ã®ããã¤ã¹ã§ HEIFï¼HEVC ã¡ãã£ã¢ãæ±ã HEIF ãç»åç¨ã HEVC ãåç»ç¨ãç»è³ªãä¿ã£ãã¾ã¾ãããå§ç¸®çã®é«ãå½¢å¼ãããã ä»é¢¨ã®æ©è½ã«ãæé©åããã¦ãã¦ããæãã®ãã©ã¼ãããæãåºã¦ããã ã¤ã¡ã¼ã¸ã·ã¼ã±ã³ã¹ è¤æ°ã®æéçã«é¢é£ã®ããç»åã¾ãã¯ä¸æçãªäºæ¸¬ç»åï¼ä¾ï¼ãã¼ã¹ãã¢ã¼ãã§æ®å½±ããç»åãã·ããã°ã©ãï¼ã®ããããã£ããã³ãµã ãã¤ã«ãç»åéã®æéçã»ç©ºéçãªé¡ä¼¼æ§ãå©ç¨ããæ¹æ³ã¨ãã¦ãããããç°ãªãäºæ¸¬ãªãã·ã§ã³ã使ç¨ãããã¨ãã§ããããããã£ã¦ãåä¸ã®HEIFãã¡ã¤ã«ã«å¤ãã®
Ghostscriptã®èå¼±æ§ããGoogle Project Zeroã®Tavis Ormandyæ°ã«ããå ¬éããã¾ãã(CVEçªå·ã¯ã¾ã ç¡ã)ãopenwallã®oss-securityã¡ã¼ãªã³ã°ãªã¹ãã«ãã¯ãã¹ãã¹ããããã®ã§ããã¡ããè¦ãæ¹ãå¤ãã§ãããã https://bugs.chromium.org/p/project-zero/issues/detail?id=1640 http://openwall.com/lists/oss-security/2018/08/21/2 åºæ¬çãªæ å ±ã¯ä»¥ä¸ã®JPCERTã¢ãã¦ã³ã¹ããåºã¦ããã®ã§ãããã§ã¯ããã¡ã£ã¨ç´°ããTopicsãããã¤ãã¾ã¨ãã¾ãã JPCERT: Ghostscript ã® -dSAFER ãªãã·ã§ã³ã®èå¼±æ§ã«é¢ãã注æåèµ· æ¦è¦ PostScriptã¯ãåãªãããã¥ã¡ã³ããã¡ã¤ã«ã®ä¸åå¼ã§ã¯ãªããæç»ã³ãã³ããª
ããã«ã¡ã¯ãã¢ããªã±ã¼ã·ã§ã³åºç¤ãã¼ã ã®éæ¨(@a_o_k_i_n_g)ã§ãã ä¸è¬ç㪠Web ã¢ããªã±ã¼ã·ã§ã³ãããã§ããããã«ããµã¤ãã¦ãºã®ã°ã«ã¼ãã¦ã§ã¢ã«ãç»åããµã ãã¤ã«ã§è¡¨ç¤ºããæ©è½ãããã¾ãããµã¤ãã¦ãºã§ã¯æ¥ã æ°ä¸ä»¶ããã以ä¸ã®ãµã ãã¤ã«ãçæãã¦ããããããã¯å ¨ã¦ ImageMagick ã«ãã£ã¦çæããã¦ãã¾ããã ããã§å¾ãç¥è¦ã¯ãã¡ãã®è¨äºã§å ¬éããã¦ãã¾ãã blog.cybozu.io ãããç¾å¨ããµã¤ãã¦ãºãã ImageMagick ã¯æ¶ãå»ãã¾ããããã®çç±ã¨ãæã ãåã£ã代æ¿æ段ã«ã¤ãã¦ç´¹ä»ãã¾ãã ImageMagick ãå¤ããçç± è¨ãã¾ã§ããªã ImageMagick ã¯åªç§ãªãã¼ã«ã§ãç»åå¤æã«é¢ããä½ããã®ãµã¼ãã¹ããã¼ã«ãä½ãå ´åã«ã¯æ¡ç¨ã®ç¬¬ä¸åè£ã«ãªããã¨ã§ããããããããç»åãã©ã¼ãããã«å¯¾å¿ããåºåç»åãããç´°ãã«å¶å¾¡ã§ããè¨å¤§ãªãªãã·
ã¯ããã« ImageMagick ã¯ç»åã®æ¡å¤§ã縮å°ããããããªãµã¤ãºå¦çãå¶å¾¡ãããªãã·ã§ã³ãå¹¾ã¤ãããã¾ãã -resize, -thumbnail, -scale, -sample, -resample, -geometryã ãããã®ãªãã·ã§ã³ã¨ããªãµã¤ãºã®ã¡ãã£ã¨ã ãç´°ãã話ããã¾ãã æ¬ã¨ã³ããªã§èª¬æããªãäº ImageMagick åå¿è ãã¯ããã«å¼ã£ãããã100x100 ãæå®ããã®ã« 100x100 ã®ç»åãåºæ¥ãªãåé¡ã¯å¥è¨äºã«ãã¾ããããã¡ãããåç §ä¸ããã ImageMagick ã® Geometry ä»æ§ https://qiita.com/yoya/items/704fdfbd881f166125d8 ãã¨ãå°ãé«åº¦ãªãªãµã¤ãºã¨ã㦠-distort Resize ãããã¾ããæéãããã£ã¦ã質ã®è¯ããªãµã¤ãºã欲ããå ´åã«ãå§ãã§ããæ´ã«ãç¹æ®ãªãªãµã¤ãºã¨ãã¦
Read it now on the OâReilly learning platform with a 10-day free trial. OâReilly members get unlimited access to books, live events, courses curated by job role, and more from OâReilly and nearly 200 top publishers. High-quality images have an amazing power of attraction. Just add some stunning photos and graphics to your website or app and watch your user engagement and conversion numbers climb.
If youâre a modern developer, then you use JPG files. Doesnât matter if youâre a web dev, mobile dev, or some weird sysadmin who just sends around memes all day. JPGs are a part of your job, and critical to the experience of the users who benefit from that work. Which is why itâs so important to make sure these JPG files are as small as possible. With the Average webpage size now larger than the o
Updated 5/12 lcamtuf With Advice On Better Mitigations Updated 5/5 Updated Policy Recommendation Updated 5/4 What's with the stupid (logo|website|twitter account)? Detailed Vulnerability Information PoC Updated 5/3 FAQs ImageMagick Is On FireâââCVE-2016â3714 TL;DR There are multiple vulnerabilities in ImageMagick, a package commonly used by web services to process images. One of the vulnerabilitie
ãããµã ãã¤ã«ã§æ³£ããªãããã® ImageMagick ãã¦ãã¦éã«ä¸è¨ããã³ã
ä¸è¬çã« ImageMagick ã®ãµã ãã¤ã«ç»åçæã¯é ãã¨ããã¦ãããããã©ã¼ãã³ã¹ãæ±ããããã·ã¼ã³ã§ã¯ Imlib2 ãªã©ã®ããé«éãªç»åå¦çã©ã¤ãã©ãªã使ããããã¨ãå¤ãã§ãã Imlib2 ã®é«éãã«ã¤ãã¦ã¯ã以åãImlib2ã§ImageMagickãã3åé«éãã¤ç¾ãããµã ãã¤ã«ç»åã®çæ - åºã®ãã«ã¹ãã¤ãã²ã¤ã¨ããã¨ã®ãã¨ãã¨ããè¨äºã§ç´¹ä»ãã¾ããããã®è¨äºã®ãã³ããã¼ã¯ã«ããã¦ãImlib2 ã«ãããµã ãã¤ã«ç»åã®çæã¯ã ImageMagick ã®3åç¨é«éã§ããã ãããã ImageMagick 㯠Imlib2 ããç»è³ªããããé«æ©è½ã§ä½¿ãããããä»ãé »ç¹ã«ã¡ã³ããã³ã¹ããã¦ãããã¨ã¦ãããåºæ¥ã¦ãã¾ãããã®ç¹ Imlib2 ã¯ã2004å¹´ããã¡ã³ããã³ã¹ããã¦ããããã»ãã¥ãªãã£ãã¼ã«ãè¦ã¤ãã£ã¦ããåLinuxãã£ã¹ããªãã¥ã¼ã·ã§ã³ãããããããããå½ã¦
ããã«ã¡ããã¢ããªã±ã¼ã·ã§ã³åºç¤ãã¼ã ã®éæ¨(@a_o_k_i_n_g)ã§ãã好ããªã¿ããã¯ç´ ããã³ãã§ãã ä»åã¯ããµã¤ãã¦ãºã®ãµã ãã¤ã«äºæ ã«ã¤ãã¦è¨äºãæ¸ãããã¨æãã¾ãããµã¤ãã¦ãºã«éããé常㮠Web ã¢ããªã±ã¼ã·ã§ã³ã§ããµã ãã¤ã«ä½æã¯ããããã¨æãã¾ããããããã©ãããå¤ãæ¶ãã¦ãããµã ãã¤ãªã¹ããå¤ããã¨æãã¾ããããããã®æ代ãçãããµã ãã¤ãªã¹ããå¿«é©ãªãµã ãã¤ã«ã©ã¤ããéãããããç¥è¦ãå ±æãããã¨æãã¾ãã å¼ç¤¾ã§ã¯ç»åå¤æãã¼ã«ã« ImageMagick ãç¨ãã¦ãããå¾ã£ã¦æ¬ç¥è¦ã¯ ImageMagick åºæã®ãã®ãã»ã¨ãã©ã§ãã ç»åæ¯è¼ã¯äººéã®ç¼ã§è¡ãã¹ã ãµã ãã¤ã«å¨ãã«ä½ãä¿®æ£ãå ¥ãããä¿®æ£åå¾ã®ç»åãæ¯è¼ãã¾ããããæ©æ¢°ã«ãããã¤ãåã®æ¯è¼ã§ã¯ç»åã®è¯ãæªãããããã¾ãããé ¼ããã®ã¯äººéã®ç¼ã ãã§ããèç¼ã§ç¢ºèªãã¾ãããã æ¯è¼ã§ãããã¼ã«ãä½ãã¨è¯
ããã«ã¡ã¯ãã¯ã©ã¤ã¢ã³ãåºç¤ãã¼ã ã®ããã§ãã ã¢ãã¿ã¼çã表示ããçºã« PNG ã JPEG ã®ç»åãå ã« GIF ã¢ãã¡ã¼ã·ã§ã³ãçæããäºãããããã¾ãããGIF 㯠256è²ã¾ã§ããæ±ããªãçºãå ç»åãæ°ä¸ã¨ãã£ãåä½ã§è²ã使ã£ã¦ããã¨æ¸è²å¦çã«å¤§å¤æéããããã¾ããããã§ãImageMagick ã®æ¸è²å¦çãæ¹é ãã¦é«éåããäºä¾ããç´¹ä»ãã¾ãã å°ãä¸åº¦ã«èªãåéã§ã¯ã¾ã¨ãåããªãçºãåç·¨ã¨å¾ç·¨ã«åãã¾ãããåç·¨ã¯æ¸è²å¦çãå¾ç·¨ã¯ãã®æ¹é ã«ã¤ãã¦èª¬æãã¾ãã ããã°ã©ã æ§æã§ã¯ä¸ã®å³ã® magick/quantize.c ãæ¸è²å¦çã«ç¸å½ãã¾ãã ã¾ããæ¸è²å¦çã®ä¸è¬çãªè©±ããå§ãã¾ãã æ¸è²ã®å©ç¹ Web ã§è¦ãããç»åãã¡ã¤ã«ã®å¤ãã¯ã1ã¤ã®pixel(æç»ã®æå°åä½)ã«å¯¾ãã¦ãRed, Green, Blue ãåã 8bits ã§è¨ 24bits(= 3bytes) ãé
å ·ä½çã«ã¯ä»¥ä¸ã®ããã«ä½¿ãåããã¨è¯ãã§ãããã ææ©ã GIF ã¢ãã¡ãä½ããã > GraphicsMagick Web ã®ããã¯ã¨ã³ãã§åãããã > YoyaMagick YoyaMagick ã使ããç°å¢ã§ã¯ãªã > ImageMagick èªåãä»ã¾ã§è³ã«ãã誤解ãå ã«ããã¤ã³ããåæãã¾ãã ã¾ããImageMagick ã® GIF ã¢ãã¡çæã«æéããããå ´åããã®å¦çã®å¤§åã¯æ¸è²å¦çã§ãã ImageMagick ã®æ¸è²ã¯ä¸»ã«æ¸è²å°ç¨ã®ãã¼ã¿æ§é ãç¨ããçºãQ8, Q16 (*2)ã«ããæ§è½ã®éãã¯æ®ã©ããã¾ããã å®ã¯ãGIF ã¢ãã¡æé©åã®å·®åãã¬ã¼ã æ½åºã¯ãæ¸è²ãGIF ã¨ã³ã³ã¼ãã®æéã«æ¯ã¹ã¦æ®ã©æéãæããã¾ããã å·®åãã¬ã¼ã ãå°ããç¨ãï¼æç®ä»¥éã® GIF ç»åãå°ãããªãããããå ¨ä½ã¨ãã¦å¦çæéãçããªãã¾ãã ImageMagick ã«æ¯ã¹ã¦ãGrap
ããã«ã¡ã¯ãããã«ã¦ã§ã¢éçºãã¼ã ã®ããã§ãã ä»åã¯ãImageMagick ã«ã¤ãã¦ã話ãã¾ãã http://www.imagemagick.org/ ImageMagick ã¯é«æ©è½ã§å¤§å¤ä¾¿å©ãªç»åå¦çãã¼ã«ã§ããå¼ç¤¾ã§ãå©ç¨ããã¦é ãã¦ãã¾ãããç¨ã«å®ãµã¼ãã¹ã«ãã®ã¾ã¾é©ç¨åºæ¥ãªãã±ã¼ã¹ãããã¾ãã ããã§ãå°ã£ãæã« ImageMagick èªä½ãæ¹é ããéã®ãã¤ã³ãã¨ãå®éã®å¿ç¨ä¾ããç´¹ä»ãã¾ãã ImageMagick ã®ããã°ã©ã æ§é ImageMagick ã®ããã°ã©ã ã¯ä¸»ã«ä»¥ä¸ã®ãã£ã¬ã¯ããªã«åããã¾ãã(Magick+ ãã£ã¬ã¯ããªçå¹¾ã¤ãã¯å²æãã¾ã) utilities/<ã³ãã³ãå>.c ã³ãã³ãã©ã¤ã³ãã¼ã«ã®èµ·ç¹(main é¢æ°) wand/ã.c (ã³ãã³ãå ±éå¦çã¨ã³ãã³ãæ¯ã®å¦çãWand API) magick/ã.c (æ©è½ã¢ã¸ã¥ã¼ã«ãã¦ã¼ãã£ãªã
ã©ã³ãã³ã°
ã©ã³ãã³ã°
ã©ã³ãã³ã°
ãªãªã¼ã¹ãé害æ å ±ãªã©ã®ãµã¼ãã¹ã®ãç¥ãã
ææ°ã®äººæ°ã¨ã³ããªã¼ã®é ä¿¡
å¦çãå®è¡ä¸ã§ã
j次ã®ããã¯ãã¼ã¯
kåã®ããã¯ãã¼ã¯
lãã¨ã§èªã
eã³ã¡ã³ãä¸è¦§ãéã
oãã¼ã¸ãéã
{{#tags}}- {{label}}
{{/tags}}