Image 如何使图像背景透明？

我有两张照片：

如果您将看到第一个图像没有背景。所以背景看起来是白色的。第二幅图像有黑色背景

• 问题1：我们称之为第一类图片

• 问题2：如何制作那种类型的图片

• 问题3：如何将第二类图片转换为第一类图片

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是的，你可以，你必须使用一些照片编辑软件，如Photoshop，试着按照本指南中的步骤操作，让我知道它是如何进行的

它们是动画GIF，第一个具有透明背景。您可以使用ImageMagick（安装在大多数Linux发行版上，OSX和Linux免费提供）将图像分割为单独的帧，如下所示：

convert -coalesce type1.gif frame%02d.gif

convert -coalesce type1.gif miff:- | montage -tile x4 -frame 5 - montage.gif

identify type1.gif

type1.gif[0] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[1] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[2] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[3] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[4] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[5] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[6] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[7] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[8] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[9] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[10] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[11] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[12] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[13] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[14] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[15] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[16] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[17] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000

convert frame* -loop 0 -delay 20 anim.gif

这将给你以下18帧作为单独的图像

frame00.gif frame04.gif frame08.gif frame12.gif frame16.gif
frame01.gif frame05.gif frame09.gif frame13.gif frame17.gif
frame02.gif frame06.gif frame10.gif frame14.gif
frame03.gif frame07.gif frame11.gif frame15.gif

frame00.gif

如果你把它们制作成这样的蒙太奇，你可以一次看到它们：

convert -coalesce type1.gif frame%02d.gif

convert -coalesce type1.gif miff:- | montage -tile x4 -frame 5 - montage.gif

identify type1.gif

type1.gif[0] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[1] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[2] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[3] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[4] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[5] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[6] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[7] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[8] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[9] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[10] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[11] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[12] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[13] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[14] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[15] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[16] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[17] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000

convert frame* -loop 0 -delay 20 anim.gif

您可以找到有关每个帧的信息，例如其大小，如下所示：

convert -coalesce type1.gif frame%02d.gif

convert -coalesce type1.gif miff:- | montage -tile x4 -frame 5 - montage.gif

identify type1.gif

type1.gif[0] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[1] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[2] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[3] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[4] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[5] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[6] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[7] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[8] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[9] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[10] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[11] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[12] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[13] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[14] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[15] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[16] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[17] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000

convert frame* -loop 0 -delay 20 anim.gif

您可以像这样将所有帧重新组合在一起：

convert -coalesce type1.gif frame%02d.gif

convert -coalesce type1.gif miff:- | montage -tile x4 -frame 5 - montage.gif

identify type1.gif

type1.gif[0] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[1] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[2] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[3] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[4] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[5] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[6] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[7] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[8] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[9] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[10] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[11] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[12] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[13] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[14] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[15] GIF 100x100 100x100+0+0 8-bit sRGB 64c 29.2KB 0.000u 0:00.000
type1.gif[16] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000
type1.gif[17] GIF 100x100 100x100+0+0 8-bit sRGB 128c 29.2KB 0.000u 0:00.000

convert frame* -loop 0 -delay 20 anim.gif

您可以尝试使用如下命令从第二个背景中删除黑色背景，使其更像第一个背景。您可能需要稍微调整一下

fuzz

因子：

convert type2.gif -fuzz 15% -transparent black new.gif