変幻画像作成（クリック推奨画像作成）Create a transparent PNG file changing from white-background to black-background Any image file is OK. Please upload two files. The picture can be used for Twitter Twitter official client (PC, mobile browser) show image file on white background on timeline. But if you click or tap the picture, bigger image is shown on black background. So it can be seen differently if the image has transparent par
