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      "body": "在數位影像領域中，JPEG/JPG和PNG是兩種普遍被應用的圖像格式。 乍看之下，同一張圖像以這兩種格式顯示或許看似相同，再仔細觀察並深入研究數據，會發覺它們間存在相當大的差異。探討重點並不在於比較哪個格式更加優異，因為每種格式都是針對特定用途而設計，取決於我們對圖像質量、文件大小等需求。接下來介紹的內容，將幫助我們了解關於這兩種格式優劣的相關知識，及充分發揮它們的優勢與應用。\n### JPEG格式是什麼?\nJPEG 是「聯合照片專家小組」（Joint Photographic Experts Group）的簡稱，這個小組是該格式的開發者，由於其在文件大小和圖像質量之間的謹慎平衡，它已成為數碼攝影和在線圖像分享中的標準壓縮格式。\n\n實際的壓縮比例取決於所使用程式與設定值，而典型 JPEG 圖像通常採 10:1 的壓縮比。以一張 10MB 圖像為例，匯出成JPEG檔案後，將得到大約 1MB 的圖像。JPEG 在品質上幾乎與原檔毫無差異，儘管取決於原始圖像的內容和文件類型。為實現這一點，JPEG 仰賴的是離散餘弦轉換(DCT)詳細內容請參閱Ken Huangn所寫的 離散餘弦轉換(Discrete Cosine Transform，DCT)簡介。儘管背後的數學公式極為復雜，但透過壓縮演算法檢查整個圖像，確定圖像中哪些像素與周圍的像素相似，並將像素合併成集合結構(具有相同值的像素組)。\n\n雖説方法效率極高，缺點是無法還原丟失數據。意思是JPEG 圖像（除了下文提到的一些例外情況）略有損壞產生，意味著圖像保存後，丟失的像素無法恢復，就像影印機複印一樣，當每回打開並保存 JPEG 時，它的質量都會稍微變差，直到最終失去所有細節。基於這原因，不建議將 JPEG 用作保存圖像的格式，因為當需要再次打開它並進行編輯，質量都會受損，但無須過度擔心，舉例 Adobe Lightroom 這類非破壞性圖像編輯軟體能協助解決這類型問題，大前提是不刪除原始文件，因為它們只編輯保存為元數據，而非覆蓋原始圖像。\n\n同時，JPEG 也應避免使用於包含大量文字或具有鮮明線條的插圖上，原因是定義明確的線條往往會因反鋸齒效應而變得模糊(關於反鋸齒詳細說明，點連結參考維基百科)。舉例來說，可以觀察到下列兩張，JPG(上)、PNG(下)，同樣像素大小及放大倍率條件下，明顯可見，JPG模糊程度多些。\n\nhttps://cdn.steemitimages.com/DQmTY6TNppxdeZR4ynxoVUUV6kypszZ8GxMrESVMJCkC4qZ/Leo%20302x403.jpeg\nhttps://cdn.steemitimages.com/DQmQea5UCpxcaajuGgnFkejVreGYXntun3xo1bmhGRK7LXs/Leo%20302x.png\n\n### PNG格式是什麼？\n PNG 是「可攜式網路圖形」（Portable Network Graphics）的縮寫，是一種無損文件格式，旨在作為對圖形交換格式（GIF）的更開放的替代品。\n\n不同於JPEG，它依賴於DCT壓縮，PNG 使用LZW壓縮，這與GIF和TIFF格式相同。簡而言之，PNG 運用LZW編碼法壓縮會將圖像數據中包含的位序列，與圖像文件中存儲的一個字典（又稱作代碼書）中的相應簡碼進行匹配。成果取得一個更小的文件，同時保持高質量。\n\nPNG 相對於JPEG的最大優勢在於其無損壓縮，這意味著每次打開和保存時不會損失質量。PNG 也很好地處理詳細的高對比圖像。因此，PNG 往往是截圖的默認文件格式，因為它可以提供幾乎完美的像素對像素的屏幕表示，而不會將像素群體壓縮在一起。\n\nPNG 的一個優點是它支持透明度。在彩色和灰度圖像中，PNG 文件中的像素可以是透明的。這使創建與圖像或網站內容整齊重疊的圖像。許多編輯程序使用方格背景來指示圖形的透明性。PNG 非常適合用於網站上所呈現的圖像。另一方面，如果在Photoshop中創建透明背景並將圖像保存為JPG，透明背景則會變成白色，因為格式不支持透明性。\n\n談到攝影，PNG 或許看似用於無損圖像存儲的可靠選擇。事實上，有許多更好的替代格式，如Adobe的數位負片.DNG 和TIFF格式。此外，PNG 本身並不原生支數位相片專屬格式EXIF的數據收集，例如，來自拍攝相機的快門速度、光圈和ISO等信息。\n\nPNG 格式為網路而生，已經證明本身價值。JPEG 是大家普遍知道的影像格式，但PNG 占據了JPEG 很難有效達到的用途。當你需要在網站上清晰地呈現圖像或覆蓋效果在其他元素上時，PNG 基本上是推薦選項。它也被檔案管理員、保護專家和其他信息科學家廣泛使用，用於數字化文件、零星記錄和實物文物，因為它具有高圖像質量和無損壓縮。\n### 總結\nJPEG 和 PNG 之間的區別是什麼，哪一個更好？ 最終，這兩種圖像格式都沒有一個比另一個更好。這只是取決於哪一種更適合滿足你的需求。\n\n如果你想在Instagram、Twitter等社交媒體上分享相機中的照片，建議使用JPEG。文件本身較小，針對攝影進行優化，幾乎所有可想像的平台和服務上都支援這檔案類型。\n\n如果你要捕捉屏幕截圖，預期編修或存留，PNG 將更適合你的需求。文件大小可能大於相等的JPEG，但你不必擔心每次保存時質量會下降，而且你知道每個像素與你上次打開時一樣銳利。大多數網頁圖形也更適合保存為PNG，因為它們可以利用透明區域。",
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      "body": "在數位影像領域中，JPEG/JPG和PNG是兩種普遍被應用的圖像格式。 乍看之下，同一張圖像以這兩種格式顯示或許看似相同，再仔細觀察並深入研究數據，會發覺它們間存在相當大的差異。探討重點並不在於比較哪個格式更加優異，因為每種格式都是針對特定用途而設計，取決於我們對圖像質量、文件大小等需求。接下來介紹的內容，將幫助我們了解關於這兩種格式優劣的相關知識，及充分發揮它們的優勢與應用。\n### JPEG格式是什麼?\nJPEG 是「聯合照片專家小組」（Joint Photographic Experts Group）的簡稱，這個小組是該格式的開發者，由於其在文件大小和圖像質量之間的謹慎平衡，它已成為數碼攝影和在線圖像分享中的標準壓縮格式。\n\n實際的壓縮比例取決於所使用程式與設定值，而典型 JPEG 圖像通常採 10:1 的壓縮比。以一張 10MB 圖像為例，匯出成JPEG檔案後，將得到大約 1MB 的圖像。JPEG 在品質上幾乎與原檔毫無差異，儘管取決於原始圖像的內容和文件類型。為實現這一點，JPEG 仰賴的是離散餘弦轉換(DCT)詳細內容請參閱Ken Huangn所寫的 離散餘弦轉換(Discrete Cosine Transform，DCT)簡介。儘管背後的數學公式極為復雜，但透過壓縮演算法檢查整個圖像，確定圖像中哪些像素與周圍的像素相似，並將像素合併成集合結構(具有相同值的像素組)。\n\n雖説方法效率極高，缺點是無法還原丟失數據。意思是JPEG 圖像（除了下文提到的一些例外情況）略有損壞產生，意味著圖像保存後，丟失的像素無法恢復，就像影印機複印一樣，當每回打開並保存 JPEG 時，它的質量都會稍微變差，直到最終失去所有細節。基於這原因，不建議將 JPEG 用作保存圖像的格式，因為當需要再次打開它並進行編輯，質量都會受損，但無須過度擔心，舉例 Adobe Lightroom 這類非破壞性圖像編輯軟體能協助解決這類型問題，大前提是不刪除原始文件，因為它們只編輯保存為元數據，而非覆蓋原始圖像。\n\n同時，JPEG 也應避免使用於包含大量文字或具有鮮明線條的插圖上，原因是定義明確的線條往往會因反鋸齒效應而變得模糊(關於反鋸齒詳細說明，點連結參考維基百科)。舉例來說，可以觀察到下列兩張，JPG(上)、PNG(下)，同樣像素大小及放大倍率條件下，明顯可見，JPG模糊程度多些。\n\nhttps://cdn.steemitimages.com/DQmTY6TNppxdeZR4ynxoVUUV6kypszZ8GxMrESVMJCkC4qZ/Leo%20302x403.jpeg\nhttps://cdn.steemitimages.com/DQmQea5UCpxcaajuGgnFkejVreGYXntun3xo1bmhGRK7LXs/Leo%20302x.png\n\n### PNG格式是什麼？\n PNG 是「可攜式網路圖形」（Portable Network Graphics）的縮寫，是一種無損文件格式，旨在作為對圖形交換格式（GIF）的更開放的替代品。\n\n不同於JPEG，它依賴於DCT壓縮，PNG 使用LZW壓縮，這與GIF和TIFF格式相同。簡而言之，PNG 運用LZW編碼法壓縮會將圖像數據中包含的位序列，與圖像文件中存儲的一個字典（又稱作代碼書）中的相應簡碼進行匹配。成果取得一個更小的文件，同時保持高質量。\n\nPNG 相對於JPEG的最大優勢在於其無損壓縮，這意味著每次打開和保存時不會損失質量。PNG 也很好地處理詳細的高對比圖像。因此，PNG 往往是截圖的默認文件格式，因為它可以提供幾乎完美的像素對像素的屏幕表示，而不會將像素群體壓縮在一起。\n\nPNG 的一個優點是它支持透明度。在彩色和灰度圖像中，PNG 文件中的像素可以是透明的。這使創建與圖像或網站內容整齊重疊的圖像。許多編輯程序使用方格背景來指示圖形的透明性。PNG 非常適合用於網站上所呈現的圖像。另一方面，如果在Photoshop中創建透明背景並將圖像保存為JPG，透明背景則會變成白色，因為格式不支持透明性。\n\n談到攝影，PNG 或許看似用於無損圖像存儲的可靠選擇。事實上，有許多更好的替代格式，如Adobe的數位負片.DNG 和TIFF格式。此外，PNG 本身並不原生支數位相片專屬格式EXIF的數據收集，例如，來自拍攝相機的快門速度、光圈和ISO等信息。\n\nPNG 格式為網路而生，已經證明本身價值。JPEG 是大家普遍知道的影像格式，但PNG 占據了JPEG 很難有效達到的用途。當你需要在網站上清晰地呈現圖像或覆蓋效果在其他元素上時，PNG 基本上是推薦選項。它也被檔案管理員、保護專家和其他信息科學家廣泛使用，用於數字化文件、零星記錄和實物文物，因為它具有高圖像質量和無損壓縮。\n### 總結\nJPEG 和 PNG 之間的區別是什麼，哪一個更好？ 最終，這兩種圖像格式都沒有一個比另一個更好。這只是取決於哪一種更適合滿足你的需求。\n\n如果你想在Instagram、Twitter等社交媒體上分享相機中的照片，建議使用JPEG。文件本身較小，針對攝影進行優化，幾乎所有可想像的平台和服務上都支援這檔案類型。\n\n如果你要捕捉屏幕截圖，預期編修或存留，PNG 將更適合你的需求。文件大小可能大於相等的JPEG，但你不必擔心每次保存時質量會下降，而且你知道每個像素與你上次打開時一樣銳利。大多數網頁圖形也更適合保存為PNG，因為它們可以利用透明區域。",
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      "body": "Thank you so much for the tips! It's very helpful",
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      "author": "jamerussell",
      "body": "Welcome to the Steem community @joyulin2010!\nWe sincerely hope you find everything you are looking for and have found a new home here.\n\nSeven suggestions to consider:\n1. Guard your passwords carefully, and only publish with the posting key,\n2. Use your active key only for wallet transactions, and Keychain,\n3. The ***owner*** password is only used to reset compromised passwords,\n4. ***DO NOT*** lose your passwords; **copy and store offline,**\n5. ***Do not publish other people's work, be it photos or written, without credit, and be sure to source all of your work, even if it is your own***.\n6. ***An introduceyourself tag is used only once***, and\n7. **Do** ***Not*** open any links in memos or comments that you do not know who they belong to. If it sounds too good to be true it probably is, so the old saying goes. There is nothing free here.\n\nI found you because @brittandjosie and @jamerussell from @heyhaveyamet presented and promoted your publication to get more exposure and help you grow faster.\n\nIf you find yourself overwhelmed and need some guidance, or if you have any questions, there are informed Steemians available who can help you; you can click to go to The Terminal in Discord here:\n\n<center><a href=https://discord.gg/XZGPGpz ><img src=\"https://files.peakd.com/file/peakd-hive/heyhaveyamet/85D5YEcj-image.png \"></a></center>\n\nHave fun and happy Steeming!",
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