將彩色PDF轉(zhuǎn)換為灰度或黑白,可以有效減小文件大小,節(jié)省打印成本,或方便預(yù)覽。本文將介紹使用Mac自帶工具和第三方應(yīng)用程序兩種方法實(shí)現(xiàn)PDF顏色轉(zhuǎn)換。
灰度圖像包含從白色到黑色的各種灰色陰影,而真正的黑白圖像只有兩種顏色:純黑色和純白色。因此,對(duì)于包含簡(jiǎn)單文本以外內(nèi)容的打印文檔,灰度通常是首選顏色格式。 將PDF保存為黑白而非灰度,文件大小會(huì)顯著減小,但文本以外的所有對(duì)象外觀都會(huì)改變。因此,將PDF從彩色轉(zhuǎn)換為灰度通常是更安全的選擇。
方法一:使用Nitro PDF Pro
Nitro PDF Pro是一款功能強(qiáng)大的PDF工具,可以創(chuàng)建、編輯、合并PDF,轉(zhuǎn)換格式,以及將PDF轉(zhuǎn)換為黑白。其功能與Mac自帶的預(yù)覽應(yīng)用和Adobe Acrobat類(lèi)似,并提供額外的注釋、填寫(xiě)和簽名表單、添加安全密碼等功能。
步驟:
- 打開(kāi)Nitro PDF Pro并打開(kāi)您的PDF文件。
- 選擇“文件”→“打印”。
- 取消勾選“彩色打印”。
- 選擇“另存為PDF”。
方法二:使用Mac自帶的預(yù)覽應(yīng)用
Mac自帶的預(yù)覽應(yīng)用也提供一些基本的編輯功能,包括將PDF轉(zhuǎn)換為黑白或灰度。
步驟:
- 打開(kāi)您的PDF文件(會(huì)自動(dòng)在預(yù)覽應(yīng)用中打開(kāi))。
- 選擇“文件”→“導(dǎo)出”。
- 在“Quartz濾鏡”部分選擇“黑白”或“灰度”。
- 點(diǎn)擊“保存”。
您也可以使用預(yù)覽應(yīng)用的打印功能來(lái)將PDF轉(zhuǎn)換為黑白:
- 在預(yù)覽應(yīng)用中打開(kāi)PDF文件。
- 選擇“文件”→“打印”。
- 取消勾選“彩色打印”。
- 選擇“另存為PDF”。
方法三:使用在線工具 (謹(jǐn)慎選擇)
許多在線服務(wù)提供免費(fèi)的PDF黑白轉(zhuǎn)換,但需謹(jǐn)慎選擇,因?yàn)樵S多網(wǎng)站可能危及您的隱私信息并傳播惡意軟件。建議優(yōu)先使用可信賴(lài)的應(yīng)用程序和服務(wù)。
高效處理PDF的建議
Nitro PDF Pro和PDF Squeezer等工具可以簡(jiǎn)化日常PDF處理流程。PDF Squeezer可以快速壓縮PDF文件,同時(shí)保持其質(zhì)量和原始外觀。
常見(jiàn)問(wèn)題:轉(zhuǎn)換為灰度是否會(huì)使PDF變小?
是的,由于彩色圖像比灰度圖像文件更大,將PDF轉(zhuǎn)換為黑白總是會(huì)減小其大小,尤其是在文檔包含照片的情況下。但請(qǐng)注意,灰度PDF可能無(wú)法正確渲染精細(xì)細(xì)節(jié)和透明度。如果您只想減小PDF大小,無(wú)需轉(zhuǎn)換為黑白,可以使用PDF Squeezer等工具進(jìn)行壓縮。
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