Image Filters
Adjust brightness, contrast, saturation, and grayscale
Image Filters — what it does
Adjust brightness, contrast, saturation and grayscale on an image with live sliders, then download the result. These four controls cover the majority of everyday corrections: rescuing an underexposed photo, giving a flat screenshot some definition, or converting an image to clean black and white.
When this tool helps
- Brightening a photo that came out too dark without opening an editor.
- Adding contrast to a washed-out screenshot before putting it in a document.
- Converting an image to grayscale for a print-friendly or monochrome layout.
How to use it
- Choose the image.
- Adjust brightness and contrast.
- Adjust saturation, or push grayscale for monochrome.
- Download the filtered image.
Accuracy, limits, and good practice
- Correct brightness before contrast: raising contrast on a dark image deepens the shadows into solid black and the detail is gone for good.
- Small moves are almost always enough. Heavy saturation looks striking on screen and garish everywhere else.
- Full grayscale plus a contrast lift is the usual recipe for a photo that has to read well in black and white print.
- Judge the result at the size it will be displayed. Adjustments that look right at full zoom often look flat in a thumbnail.
Frequently asked questions
Can I undo a filter after downloading?
Not from the output. Adjustments are baked into the exported file, so keep the original for further edits.
Why does the image look posterised?
Extreme contrast or brightness collapses tonal steps into bands. Ease the sliders back until gradients look smooth again.
Is quality lost?
Adjustment itself is a pixel operation; the loss comes from re-encoding, so export at high quality if the image will be edited further.
Can I apply the same settings to several images?
Not in one pass here. Note the values and repeat them, or use the batch tools where the operation is supported across files.
Related tools on this site
- Image Histogram — Inspect brightness and RGB distribution in an image
- Photo ID Sheet Generator — Arrange repeated ID photos on an A4 or Letter sheet
- Circular Avatar Crop — Crop an image into a circular PNG avatar
Everything above runs inside this page. Image Filters needs no account, no upload, and no server round trip — close the tab and nothing is left behind.
圖片濾鏡調整能做什麼
用即時滑桿調整圖片的亮度、對比、飽和度與灰階，然後下載結果。這四項控制涵蓋了日常大部分修正需求：救回曝光不足的照片、讓平淡的截圖有層次，或把圖片轉成乾淨的黑白。
什麼時候用得上
- 不開修圖軟體，把拍得太暗的照片調亮。
- 為灰濛濛的截圖加上對比，再放進文件裡。
- 把圖片轉成灰階，配合適合印刷或單色的版面。
使用步驟
- 選擇圖片。
- 調整亮度與對比。
- 調整飽和度，或推高灰階做成單色。
- 下載調整後的圖片。
精確度、限制與實務建議
- 先調亮度再調對比：在暗圖上拉對比，暗部會直接壓成純黑，細節就永遠回不來了。
- 小幅調整幾乎總是足夠。飽和度拉太高在螢幕上很搶眼，換到其他地方就俗豔。
- 全灰階加一點對比，是讓照片在黑白印刷中好看的標準配方。
- 請以實際展示的尺寸判斷結果。放大檢視時剛剛好的調整，縮成縮圖後常常顯得平淡。
常見問題
下載後還能還原濾鏡嗎？
從輸出檔無法還原。調整已寫入匯出檔案，需要再修改請保留原檔。
為什麼圖片出現色塊分層？
對比或亮度過度會把色階壓成塊狀。請把滑桿往回收，直到漸層恢復平滑。
會損失畫質嗎？
調整本身是像素運算，損失來自重新編碼；若之後還要編輯，請以高品質匯出。
可以把同一組設定套到多張圖嗎？
此處無法一次套用。請記下數值逐張重複，或改用支援跨檔操作的批量工具。
本站相關工具
以上步驟全部在這個頁面內完成，圖片濾鏡調整 不需要註冊、不上傳檔案、也不經過伺服器，關閉分頁後不會留下任何資料。