blocks|key|1579627|text|不允许透明的AFAIK+png。使用jpg或更新您的png+(photoshop或您用来创建png的任何东西)并删除透明区域。如果你和阴影一起工作，使用jpg，这不会让你头疼。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1579628|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

AFAIK png with transparency is not allowed. use jpg OR update your png (photoshop or whatever you using to create the png) and delete the transparency areas. if you work with shadows, use jpg, that will do no headaches.

blocks|key|1579662|text|我发现您也可以在预览中重新导出png，但在保存时取消选中Alpha复选框。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1579663|​|1579664|📷|atomic|offset|length|1579665|1579666|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/566e9f7bf0247c2e049650d82092c8f5.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

I've found you can also just re-export the png's in Preview, but uncheck the Alpha checkbox when saving. 

<img src="https://i.stack.imgur.com/MemhT.png" alt="enter image description here">

blocks|key|627660|text|如果你在使用Photoshop，go文件>保存网页(命令%2B选项%2B+Shift+%2B+S)。确保透明度没有被检查，这应该是可行的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627661|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

If you are using Photoshop go File > Save for web (Command + Option + Shift + S). Make sure the Transparency is unchecked and this should work.

blocks|key|629074|text|为此，我制作了一个新的简单工具。您可以在几秒钟内删除多个.png文件的alpha通道(透明性)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|629075|​|629076|📷|atomic|offset|length|629077|629078|您可以从这里下载http://alphachannelremover.blogspot.com|629079|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/060212efce0ce15953c995966f5c9aa0.png|imageAlt|1|LINK|MUTABLE|url|http://alphachannelremover.blogspot.com/^0|0|0|0|1|0|0|0|8|13|1|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|11|8|@]|9|@$G|12|H|13|1|14]]|A|$]]|$1|I|3|C|5|6|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|16|8|@]|9|@$G|17|H|18|1|19]]|A|$]]|$1|L|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|S|T|-4]]|U|$5|V|P|W|A|$X|Y]]]]

For this i made a new simple tool. You can remove alpha channel (transparency) of multiple .png files within seconds.

<img src="https://i.stack.imgur.com/ltWmv.png" alt="Alpha Channel Remover">

You can download from here <a href="http://alphachannelremover.blogspot.com" rel="noreferrer">http://alphachannelremover.blogspot.com</a>

blocks|key|1579801|text|我能够使用[医]意象删除alpha通道并压缩png文件。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1579802|entityMap|0|LINK|mutability|MUTABLE|url|https://imageoptim.com/^0|5|5|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

i was able to use <a href="https://imageoptim.com/" rel="noreferrer">imageoptim</a> to remove alpha channel and compress png files.

blocks|key|627707|text|为了解决这个问题，我使用烟花将我的png32文件批量转换为png24，以便快速轻松地上传。Jpeg也能工作，但它是有损的。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627708|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

To get around the problem I batched converted using fireworks my png32 files to png24 for upload quick and easy. Jpeg works also but it is lossy.

blocks|key|627715|text|您可以使用"-c+2“标志从命令行中删除PNG文件中的alpha通道：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627716|$+file+input.png
input.png:+PNG+image+data,+1024+x+1024,+8-bit/color+RGBA,+non-interlaced
$+pngcrush+-q+-c+2+input.png+output.png
libpng+warning:+iCCP:+known+incorrect+sRGB+profile
$+file+output.png
output.png:+PNG+image+data,+1024+x+1024,+8-bit/color+RGB,+non-interlaced|code-block|syntax|javascript|627717|注意从RGBA到RGB的变化:+Alpha通道消失了！|627718|住在http://pmt.sourceforge.net/pngcrush/|offset|length|627719|entityMap|0|LINK|mutability|MUTABLE|url|http://pmt.sourceforge.net/pngcrush/^0|0|0|0|2|10|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

You can remove the alpha channel from a PNG file from the command line with pngcrush, using the flag "-c 2":

<pre><code>$ file input.png
input.png: PNG image data, 1024 x 1024, 8-bit/color RGBA, non-interlaced
$ pngcrush -q -c 2 input.png output.png
libpng warning: iCCP: known incorrect sRGB profile
$ file output.png
output.png: PNG image data, 1024 x 1024, 8-bit/color RGB, non-interlaced
</code></pre>

Note the change from RGBA to RGB: the Alpha channel is gone!

pngcrush lives at <a href="http://pmt.sourceforge.net/pngcrush/" rel="nofollow">http://pmt.sourceforge.net/pngcrush/</a>

blocks|key|340700|text|如果安装了imagemagick，则可以将以下别名放入.bash_profile中。它将将目录中的每个png转换为一个jpg，它会自动删除alpha。您可以使用生成的jpg文件作为屏幕截图。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340701|alias+pngToJpg='for+i+in+*.png;+do+convert+$i+${i/.png/}.jpg;+done'|code-block|syntax|javascript|340702|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

If you have imagemagick installed, then you can put the following alias into your .bash_profile. It will convert every png in a directory to a jpg, which automatically removes the alpha. You can use the resulting jpg files as your screen shots.

<pre><code>alias pngToJpg='for i in *.png; do convert $i ${i/.png/}.jpg; done'
</code></pre>

blocks|key|340728|text|这里对我起作用的是使用jpg文件而不是PNG，因为jpg文件不使用alpha或透明特性。我是通过在线图像转换器完成的，或者你也可以在预览中打开图像，然后文件->导出和取消选中alpha选项来保存图像并使用该图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340729|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

What worked for me here was using a jpg file instead of PNG as jpg files don't use alpha or transparency features. I did it via online image converter or you can also open the image in preview and then File->Export and uncheck alpha as option to save the image and use this image.

blocks|key|1580016|text|使用mogrify工具从ImageMagick包删除alpha通道。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1580017|brew+install+imagemagick
cd+folder_with_images
mogrify+-alpha+off+*/*.png|code-block|syntax|javascript|1580018|从5月3日起更新|BOLD|1580019|您可以通过运行以下命令来判断图像是否包含alpha通道：|1580020|sips+-g+all+image.png|1580021|如果您在iOS模拟器中呈现屏幕截图，您可以通过将BOOL+opaque+=+YES传递给UIGraphicsBeginImageContextWithOptions来删除alpha通道|1580022|UIGraphicsBeginImageContextWithOptions(imageSize,+YES,+0);+|1580023|entityMap^0|2|7|C|B|0|0|0|8|0|0|0|O|H|18|12|0|0^^$0|@$1|2|3|4|5|6|7|X|8|@$9|Y|A|Z|B|C]|$9|10|A|11|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|12|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|13|8|@$9|14|A|15|B|M]]|D|@]|E|$]]|$1|N|3|O|5|6|7|16|8|@]|D|@]|E|$]]|$1|P|3|Q|5|H|7|17|8|@]|D|@]|E|$I|J]]|$1|R|3|S|5|6|7|18|8|@$9|19|A|1A|B|C]|$9|1B|A|1C|B|C]]|D|@]|E|$]]|$1|T|3|U|5|H|7|1D|8|@]|D|@]|E|$I|J]]|$1|V|3|-4|5|6|7|1E|8|@]|D|@]|E|$]]]|W|$]]

Use <code>mogrify</code> tool from <code>ImageMagick</code> package to remove alpha channel.

<pre><code>brew install imagemagick
cd folder_with_images
mogrify -alpha off */*.png
</code></pre>

Update from May 3

You can tell whether image contains alpha channel by running:

<pre><code>sips -g all image.png
</code></pre>

In case you render screenshots in iOS Simulator you can drop alpha channel by passing <code>BOOL opaque = YES</code> to <code>UIGraphicsBeginImageContextWithOptions</code>:

<pre><code>UIGraphicsBeginImageContextWithOptions(imageSize, YES, 0); 
</code></pre>

blocks|key|629256|text|将您的PNG图像转换为JPEG格式。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|629257|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Convert your PNG image to JPEG format.

blocks|key|1580095|text|当将照片上传到iTunes连接时，必须删除alpha通道。|type|blockquote|depth|inlineStyleRanges|entityRanges|data|1580096|您可以通过预览、Photoshop+(旧iPhoto)、Pixelmator、Adobe和GIMP来实现这一点。|unstyled|1580097|预览|offset|length|style|BOLD|1580098|在预览中打开照片(如果照片在你的相册中，在Photos应用程序(旧iPhoto)中)，然后简单地将它从相册拖到桌面。然后控制-点击(鼠标右键)复制的照片，并选择Preview.app在打开菜单下.|ordered-list-item|1580099|选择导出…在“文件”菜单下，在选择目标后，取消选中底部的Alpha，然后单击“导出”。|1580100|📷|atomic|1580101|1580102|像素|1580103|在Pixelmator中打开图像，而不创建新的Pixelmator文件。把照片拖到Pixelmator窗口。|1580104|在“共享”菜单中，单击“为网络…导出”|1580105|1580106|在顶部栏中，取消选择“透明”。|1580107|单击“下一步”，然后将新文件保存在某个位置。|1580108|最后，将新照片上传到iTunes连接。|1580109|GIMP|1580110|在GIMP中打开照片。|1580111|打开图层菜单。|1580112|在“透明度”下，单击“删除阿尔法通道”。|1580113|保存照片。|1580114|Adobe+|1580115|在中打开照片。|1580116|在“图层”菜单下，单击“图层蒙版”，然后单击“透明度”。|1580117|通过右键单击图层面板中的掩码并选择“删除图层掩码”来删除图层掩码。|1580118|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://developer.qcloudimg.com/http-save/yehe-900000/9fd57cbe2c512ec837358b0cccb748d9.png|imageAlt|1|https://developer.qcloudimg.com/http-save/yehe-900000/37b969b9e08d7e6c40ead3ed9c095fa8.png|2|https://developer.qcloudimg.com/http-save/yehe-900000/f1d98bacc71b11c1dd3b5a942ba5ce77.png^0|0|0|0|2|0|0|0|0|1|0|0|0|1|1|0|0|2|0|0|0|0|1|2|0|0|0|0|0|4|0|0|0|0|0|0|6|0|0|0|0^^$0|@$1|2|3|4|5|6|7|21|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|22|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|23|8|@$G|24|H|25|I|J]]|9|@]|A|$]]|$1|K|3|L|5|M|7|26|8|@]|9|@]|A|$]]|$1|N|3|O|5|M|7|27|8|@]|9|@]|A|$]]|$1|P|3|Q|5|R|7|28|8|@]|9|@$G|29|H|2A|1|2B]]|A|$]]|$1|S|3|Q|5|R|7|2C|8|@]|9|@$G|2D|H|2E|1|2F]]|A|$]]|$1|T|3|U|5|D|7|2G|8|@$G|2H|H|2I|I|J]]|9|@]|A|$]]|$1|V|3|W|5|M|7|2J|8|@]|9|@]|A|$]]|$1|X|3|Y|5|M|7|2K|8|@]|9|@]|A|$]]|$1|Z|3|Q|5|R|7|2L|8|@]|9|@$G|2M|H|2N|1|2O]]|A|$]]|$1|10|3|11|5|M|7|2P|8|@]|9|@]|A|$]]|$1|12|3|13|5|M|7|2Q|8|@]|9|@]|A|$]]|$1|14|3|15|5|D|7|2R|8|@]|9|@]|A|$]]|$1|16|3|17|5|D|7|2S|8|@$G|2T|H|2U|I|J]]|9|@]|A|$]]|$1|18|3|19|5|M|7|2V|8|@]|9|@]|A|$]]|$1|1A|3|1B|5|M|7|2W|8|@]|9|@]|A|$]]|$1|1C|3|1D|5|M|7|2X|8|@]|9|@]|A|$]]|$1|1E|3|1F|5|M|7|2Y|8|@]|9|@]|A|$]]|$1|1G|3|1H|5|D|7|2Z|8|@$G|30|H|31|I|J]]|9|@]|A|$]]|$1|1I|3|1J|5|M|7|32|8|@]|9|@]|A|$]]|$1|1K|3|1L|5|M|7|33|8|@]|9|@]|A|$]]|$1|1M|3|1N|5|M|7|34|8|@]|9|@]|A|$]]|$1|1O|3|-4|5|D|7|35|8|@]|9|@]|A|$]]]|1P|$1Q|$5|1R|1S|1T|A|$1U|1V|1W|-4]]|1X|$5|1R|1S|1T|A|$1U|1Y|1W|-4]]|1Z|$5|1R|1S|1T|A|$1U|20|1W|-4]]]]

<blockquote>
You must remove alpha channels when uploading a photo to iTunes Connect.
</blockquote>
You can do this by Preview, Photos App (old iPhoto), Pixelmator, Adobe Photoshop and GIMP.
Preview
<ol>
<li>Open the photo in Preview (if the photo is in your photo album in Photos app (the old iPhoto), then simply drag it from the album to desktop. Then control-click (right-click when mouse) the duplicated photo and select Preview.app under Open With menu).
</li>
<li>Select Export… under File menu, and after selecting the destination, uncheck Alpha at the bottom, and click Export.
<img src="https://i.stack.imgur.com/J7Vbm.png" alt="File ==&gt; Export..." />
<a href="https://i.stack.imgur.com/BTr1h.png" rel="noreferrer"><img src="https://i.stack.imgur.com/BTr1h.png" alt="Alpha" /></a>
</li>
</ol>
Pixelmator
<ol>
<li>Open the image in Pixelmator, without creating a new Pixelmator file. Just drag the photo to the Pixelmator window.
</li>
<li>From Share menu, click Export for Web…
<a href="https://i.stack.imgur.com/7lB2Z.png" rel="noreferrer"><img src="https://i.stack.imgur.com/7lB2Z.png" alt="PM" /></a>
</li>
<li>In the top bar, deselect Transparency.
</li>
<li>Click Next and then save the new file somewhere.
</li>
</ol>
Finally, upload the new photo to iTunes Connect.
GIMP
<ol>
<li>Open the photo in GIMP.
</li>
<li>Open the Layer menu.
</li>
<li>Under Transparency, click Remove Alpha Channel.
</li>
<li>Save the photo.
</li>
</ol>
Adobe Photoshop
<ol>
<li>Open the photo in Adobe Photoshop.
</li>
<li>Under Layer menu, click Layer Mask and then From Transparency.
</li>
<li>Delete the layer mask by right-clicking on the mask in the Layer panel and selecting Delete Layer Mask.
</li>
</ol>

blocks|key|1580123|text|面对同样的问题，尝试使用JPG格式！|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580124|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Faced same issue, Try using JPG format !!

blocks|key|629368|text|面对同样的问题，尝试使用JPG格式！这里对我起作用的是使用jpg文件而不是PNG，因为jpg文件不使用alpha或透明特性。我是通过在线图像转换器完成的，或者你也可以在预览中打开图像，然后文件->导出和取消选中alpha选项来保存图像并使用该图像。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|629369|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Faced same issue, Try using JPG format !! What worked for me here was using a jpg file instead of PNG as jpg files don't use alpha or transparency features. I did it via online image converter or you can also open the image in preview and then File->Export and uncheck alpha as option to save the image and use this image.

blocks|key|340947|text|太简单了..。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|340948|在预览应用程序中打开图像，单击文件、->导出和uncheck+alpha|offset|length|style|BOLD|340949|entityMap^0|0|1|2|F|7|N|D|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@$D|L|E|M|F|G]|$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|I|$]]

it's so easy...
Open image in Preview app click File -&gt; Export and
uncheck alpha

blocks|key|1580177|text|Photoshop|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580178|切成片|ordered-list-item|1580179|为网页保存|1580180|不检查透明度|1580181|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|M|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|N|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|O|8|@]|9|@]|A|$]]]|J|$]]

Photoshop

<ol>
<li>Slice it </li>
<li>Save for web </li>
<li>Uncheck Transparency</li>
</ol>

blocks|key|341066|text|您只需创建一个新的Photoshop文档，并将其默认背景设置为白色，而不是透明的。然后，复制并粘贴您的图像到新创建的文档并保存它。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|341067|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can simply create a new Photoshop document and set its default background to White instead of Transparent. Then, copy and paste your image to the newly created document and save it.

blocks|key|627874|text|2019年：=仍是个问题)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627875|这对我有用:选择您想上传的所有图像，右键单击->，在预览中单击->打开，->导出->，取消选中alpha+->，使用导出的图像。|627876|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Still a problem in 2019 :=)

This worked for me:
Select all images you want to upload -> Right click -> Open in Preview -> Export -> Uncheck alpha -> Use the exported images.

blocks|key|1580310|text|扩展罗马B.答案。这仍然是个问题，我上传了一个科多瓦应用程序。使用mogrify的我的解决方案|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1580311|brew+install+imagemagick
*+navigate+to+`platforms/ios/<your_app_name>/Images.xcassets/AppIcon.appiconset`*
mogrify+-alpha+off+*.png|code-block|syntax|javascript|1580312|然后成功地进行了归档和验证。|1580313|entityMap^0|X|7|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|S|8|@]|D|@]|E|$]]|$1|M|3|-4|5|6|7|T|8|@]|D|@]|E|$]]]|N|$]]

Extending Roman B. answer. This is still a problem, I was uploading a cordova app. my solution using <code>mogrify</code>:

<pre><code>brew install imagemagick
* navigate to `platforms/ios/&lt;your_app_name&gt;/Images.xcassets/AppIcon.appiconset`*
mogrify -alpha off *.png
</code></pre>

Then archived and validated successfully.

blocks|key|1580315|text|您可以在预览中导出到不带alpha的PNG。只需打开图像，选择导出，选择PNG，取消选中Alpha，然后单击Save。预览还支持批量导出，如果您打开您的所有图像一次。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580316|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

You can export to PNG without alpha in Preview. Simply open your image, choose export, select PNG, uncheck Alpha, and click Save. Preview also support batch export if you open all your images at once.

blocks|key|1580342|text|从Sketch出口|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1580343|为了避免透明性，确保图层不超出图板的界限。|1580344|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

<h3>Exporting from Sketch</h3>

To avoid transparency, ensure no layer extends beyond the artboard bounds.

blocks|key|627902|text|在Windows+10上，您可以使用3D油漆。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|627903|打开图像|ordered-list-item|627904|在顶部菜单中选择“画布”|627905|取消选中右侧面板中的“透明画布”复选框。|627906|保存|627907|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$]]|$1|E|3|F|5|D|7|O|8|@]|9|@]|A|$]]|$1|G|3|H|5|D|7|P|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|Q|8|@]|9|@]|A|$]]|$1|K|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|L|$]]

On Windows 10 you can use Paint 3D.
<ol>
<li>Open the image</li>
<li>Choose &quot;Canvas&quot; in the top menu</li>
<li>De-select the &quot;Transparent canvas&quot; checkbox in the right panel</li>
<li>Save</li>
</ol>

Apple has released new version of iTunes Connect &amp; I got an error message when I tried to set Screenshots on itunes connect for my app.

<pre><code>"Images can't contain alpha channels or transparencies." 
</code></pre>

<img src="https://i.stack.imgur.com/D7yIp.png" alt="enter image description here">

Images can't contain alpha channels or transparencies

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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苹果公司发布了新版本的iTunes连接&当我试图为我的应用程序设置itunes屏幕截图时，我收到了一条错误消息。"Images can't contain alpha channels or transparencies." ​​

问图像不能包含alpha通道或透明
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