{"id":606,"date":"2023-07-10T14:53:07","date_gmt":"2023-07-10T06:53:07","guid":{"rendered":"https:\/\/www.zhidianwl.net\/zhidianwl\/?p=606"},"modified":"2023-07-10T14:53:07","modified_gmt":"2023-07-10T06:53:07","slug":"app%e5%bc%80%e5%8f%91jpg%e5%8e%8b%e7%bc%a9%e6%98%af%e6%80%8e%e4%b9%88%e5%81%9a%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.zhidianwl.net\/zhidianwl\/2023\/07\/10\/app%e5%bc%80%e5%8f%91jpg%e5%8e%8b%e7%bc%a9%e6%98%af%e6%80%8e%e4%b9%88%e5%81%9a%e7%9a%84%ef%bc%9f\/","title":{"rendered":"app\u5f00\u53d1jpg\u538b\u7f29\u662f\u600e\u4e48\u505a\u7684\uff1f"},"content":{"rendered":"

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\u4e00\u3001JPG\u683c\u5f0f\u7b80\u4ecb<\/p>\n

JPG\uff08Joint Photographic Experts Group\uff0c\u8054\u5408\u6444\u5f71\u4e13\u5bb6\u5c0f\u7ec4\uff09\u662f\u4e00\u79cd\u91c7\u7528\u6709\u635f\u538b\u7f29\u7b97\u6cd5\u7684\u56fe\u7247\u683c\u5f0f\u3002JPG\u683c\u5f0f\u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u7167\u7247\u3001\u5c4f\u5e55\u622a\u56fe\u7b49\u9ad8\u5206\u8fa8\u7387\u7684\u3001\u989c\u8272\u8f83\u4e3a\u4e30\u5bcc\u7684\u56fe\u7247\u3002JPG\u7684\u538b\u7f29\u7387\u975e\u5e38\u9ad8\uff0c\u53ef\u4ee5\u5728\u4e0d\u5927\u6253\u6298\u6263\u56fe\u7247\u8d28\u91cf\u7684\u60c5\u51b5\u4e0b\u6781\u5927\u5730\u51cf\u5c11\u56fe\u7247\u7684\u6587\u4ef6\u5927\u5c0f\u3002<\/p>\n

\u4e8c\u3001JPG\u538b\u7f29\u539f\u7406<\/p>\n

JPG\u538b\u7f29\u7b97\u6cd5\u4e3b\u8981\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a\u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff08DCT\uff09\u548c\u91cf\u5316\u3002<\/p>\n

1. \u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff08DCT\uff09<\/p>\n

\u9996\u5148\uff0cJPG\u538b\u7f29\u7b97\u6cd5\u5bf9\u56fe\u7247\u8fdb\u884c\u9884\u5904\u7406\uff0c\u5c06\u539f\u8272\u6a21\u578b\u8f6c\u4e3a\u4eae\u5ea6\u548c\u8272\u5ea6\uff0c\u628aRGB\u989c\u8272\u7a7a\u95f4\u7684\u4e09\u4e2a\u8272\u5f69\u901a\u9053\u53d8\u6362\u5230\u4e00\u4e2aYCbCr\u8272\u5f69\u7a7a\u95f4\u4e2d\uff0c\u8fd9\u662f\u56e0\u4e3a\u4eba\u773c\u5bf9\u4eae\u5ea6\u7684\u654f\u611f\u7a0b\u5ea6\u8fdc\u9ad8\u4e8e\u5bf9\u8272\u5ea6\u7684\u654f\u611f\u7a0b\u5ea6\u3002 <\/p>\n

\u4e4b\u540e\uff0cJAPP\u5f00\u53d1<\/a>PG\u5bf9\u56fe\u7247\u8fdb\u884c\u79bb\u6563\u4f59\u5f26\u53d8\u6362\uff08DCT\uff09\u3002DCT\u662f\u4e00\u79cd\u76f8\u5f53\u4e8e\u5bf9\u56fe\u50cf\u8fdb\u884c\u5085\u91cc\u53f6\u53d8\u6362\u7684\u6280\u672f\u3002\u5b83\u5c06\u56fe\u50cf\u8f6c\u6362\u4e3a\u5b83\u7684\u9891\u57df\u8868\u793a\uff0cAPP<\/a>\u4ee5\u66f4\u5bb9\u6613\u5730\u538b\u7f29\u548c\u5904\u7406\u6570\u636e\u3002<\/p>\n

2. \u91cf\u5316<\/p>\n

\u91cf\u5316\u662fJPG\u538b\u7f29\u7b97\u6cd5\u7684\u7b2c\u4e8c\u6b65\uff0c\u5b83\u7528\u4e8e\u5c06DCT\u7cfb\u6570\u538b\u7f29\u548c\u91cf\u5316\u5230\u66f4\u5c0f\u7684\u503c\u3002\u91cf\u5316\u662f\u4e00\u4e2a\u6709\u635f\u7684\u8fc7\u7a0b\uff0c\u56e0\u4e3a\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u66f4\u591a\u6570\u636e\u88ab\u51cf\u5c11\u548c\u820d\u5f03\u3002\u4e3a\u4e86\u4fdd\u8bc1\u826f\u597d\u7684\u538b\u7f29\u6548\u679c\uff0cJPG\u7b97\u6cd5\u91c7\u7528\u4e86\u91cf\u5316\u8868\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u91cf\u5316\u8868\u4e2d\u7684\u6570\u503c\u5173\u7cfb\u5230\u538b\u7f29\u7684\u8d28\u91cf\u548c\u6587\u4ef6\u5927\u5c0f\u3002\u91c7\u7528\u76f8\u5bf9\u8f83\u9ad8\u7684\u91cf\u5316\u6570\u636e\u53ef\u4ee5\u51cf\u5c11\u6587\u4ef6\u5927\u5c0f\u548c\u4e00\u4e9b\u5931\u771f\uff08\u4f8b\u5982JPEG\u538b\u7f29\u540e\u7684\u952f\u9f7f\u6548\u679c\u7b49\uff09\uff0c\u4f46\u4f1a\u5bfc\u81f4\u538b\u7f29\u56fe\u50cf\u4fe1\u606f\u7684\u4e22\u5931\u3002<\/p>\n

\u4e09\u3001JPG\u538b\u7f29\u7684\u65b9\u6cd5<\/p>\n

1. \u8f6c\u6362\u989c\u8272\u7a7a\u95f4<\/p>\n

\u5728\u5f00\u59cb\u56fe\u7247\u538b\u7f29\u65f6\uff0c\u9996\u5148\u5c06RGB\u989c\u8272\u7a7a\u95f4\u8f6c\u6362\u4e3aYCbCr\u989c\u8272\u7a7a\u95f4\u3002\u53ef\u4ee5<\/p>\n

<\/figure>\n<\/p>\n

\u4f7f\u7528Android\u7c7b\u5e93\u4e2d\u7684android.graphics.Bitmap\u7c7b\u7684getColorSpace()\u65b9\u6cd5\u5b8c\u6210\u6b64\u64cd\u4f5c\u3002<\/p>\n

2. \u4f18\u5316DCT\u91cf\u5316\u8868<\/p>\n

\u5728\u4f7f\u7528JPG\u8fdb\u884c\u538b\u7f29\u65f6\uff0c\u53ef\u4ee5\u4f18\u5316DCT\u91cf\u5316\u8868\uff0c\u4f7f\u538b\u7f29\u540e\u7684\u56fe\u7247\u6548\u679c\u66f4\u597d\u3002DCT\u91cf\u5316\u8868\u4e2d\u7684\u6570\u503c\u5bf9\u538b\u7f29\u6548\u679c\u6709\u5f88\u5927\u7684\u5f71\u54cd\u3002\u53ef\u4ee5\u4f7f\u7528\u5df2\u6709\u7684\u4f18\u5316DCT\u91cf\u5316\u8868\uff0c\u4e5f\u53ef\u4ee5\u6839\u636e\u9700\u8981\u81ea\u5b9a\u4e49DCT\u91cf\u5316\u8868\u3002<\/p>\n

3. \u9010\u884c\u538b\u7f29<\/p>\n

\u5728JPG\u538b\u7f29\u4e2d\uff0c\u5c06\u56fe\u7247\u9010\u884c\u538b\u7f29\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u538b\u7f29\u6548\u7387\u3002\u8fd9\u662f\u56e0\u4e3a\u6bcf\u4e00\u884c\u4e2d\u7684\u6570\u636e\u90fd\u662f\u72ec\u7acb\u7684\uff0c\u53ef\u4ee5\u5e76\u884c\u538b\u7f29\u3002<\/p>\n

4. \u91ca\u653e\u5185\u5b58<\/p>\n

\u5728\u538b\u7f29\u8fc7\u7a0b\u4e2d\uff0c\u9700\u8981\u4f18\u5316\u5185\u5b58\u7684\u4f7f\u7528\u3002\u53ef\u4ee5\u4f7f\u7528Android\u7c7b\u5e93\u4e2d\u7684android.graphics.Bitmap\u7c7b\u7684recycle()\u65b9\u6cd5\u91ca\u653e\u4e0d\u518d\u4f7f\u7528\u7684\u5185\u5b58\u3002<\/p>\n

\u603b\u7ed3\uff1a<\/p>\n

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