Photoshop的History面板和History Brush工具通過記錄編輯步驟並允許選擇性還原來提升圖像編輯控制力。 History面板以時(shí)間軸形式保存最多20個(gè)操作狀態(tài)（可自定義），支持跳轉(zhuǎn)至任意歷史節(jié)點(diǎn)恢復(fù)整個(gè)文件，但關(guān)閉文件後會清除記錄；History Brush則可在特定區(qū)域還原指定歷史狀態(tài)，結(jié)合畫筆設(shè)置實(shí)現(xiàn)局部修正，例如在去飽和效果中保留人物面部色彩。使用時(shí)需注意：儘早應(yīng)用、創(chuàng)建快照備份關(guān)鍵階段、配合圖層蒙版增加靈活性，並留意內(nèi)存佔(zhàn)用問題，儘管它們適合快速調(diào)整和實(shí)驗(yàn)性編輯，但無法替代非破壞式編輯方法如調(diào)整圖層。

The History panel and History Brush tool in Photoshop are designed to help you undo or redo changes selectively, giving you more control over your editing process. While the Undo command (Ctrl Z) only takes you back one step, these tools let you jump to any previous state of your document — and even paint back parts of earlier versions without affecting the whole image.

What the History Panel Does

The History panel acts like a timeline of every action you've made in your current Photoshop session. Each time you make an edit—like adjusting brightness, applying a filter, or using a brush—it shows up as a new step in the list.

• You can click on any previous state to revert the entire document to that point
• It helps you compare different versions of your work without saving multiple files
• By default, Photoshop keeps 20 history states, but you can change this in Preferences > Performance

One thing to note: closing and reopening a file clears its history. So if you want to keep going back to older versions, it's a good idea to save copies manually.

How the History Brush Works

The History Brush lets you "paint back" to a previous state of your image — selectively undoing edits in specific areas. This is super useful when you've applied adjustments or filters that look good overall but need correction in certain spots.

Here's how it works:

• Set the History Brush to a specific past state (click the brush icon next to it in the History panel)
• Paint over areas where you want to restore the earlier version
• The brush uses your current brush settings, so you can adjust size, flow, and opacity for precision

For example, if you applied a strong desaturation effect but want to bring color back into someone's face, the History Brush can help do just that without undoing everything.

Tips for Using These Tools Effectively

Both tools are powerful, but they have some limitations and best practices to keep in mind:

• Use them early in your workflow – Once you've flattened your image or saved and closed it, you lose access to detailed history states
• Create snapshots – In the History panel, click the camera icon to save a snapshot of a key editing stage. This way, you always have a fallback point
• Combine with layer masks – Instead of painting directly with the History Brush, consider using a layer mask for more flexibility
• Be aware of memory use – Keeping many history states or large snapshots can slow Photoshop down

These tools won't replace non-destructive editing methods like adjustment layers, but they're great for quick fixes and experimental edits.

基本上就這些。

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