剛好談到這話題~
就順便提供一下小撇步好了^^"
要上傳的圖片最好先調整至120x120左右~
因為圖片太大在論壇勢必要縮小,這會造成頭像的輪廓有鋸齒~
如果圖片太小在論壇勢必要放大,這會造成頭像模糊不清~
所以最好先調整圖片的解析度再上傳,盡量避免在論壇調整大小~
以上應該看得懂吧
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再補充一下好了=="
圖片重新採樣通常會有下面三種瑕疵(artifact)
Blur is a loss of image sharpness. It can be seen on images up-scaled using bilinear or bicubic interpolation.
Aliasing appears as jagged edges (during up-scaling) or moire patterns (during down-scaling). It is present in images up-scaled using all linear methods, but it is most visible with nearest neighbor, bicubic, and bilinear methods.
Ringing (also known as Gibbs phenomenon) appears as halo around edges. It is clearly visible with sinc, Lanczos, and bicubic methods. Some small amount of ringing improves the perceived sharpness of the image, but high amount of ringing becomes annoying.
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