我试图用艺术品作为面具来实现一个旋转的圆圈。从我所见,没有办法使用移动水印或图像的自动旋转。是否可以使用transloadit?
结果应该是“乙烯基”旋转。
这个问题回答起来相当复杂,但使用 Transloadit 非常可行。我将使用 python 主要为OpenCV回答它,但当然你可以使用你喜欢的语言——我会尽量让它与语言无关。我使用了 4 个不同的模板来获得我们想要的结果,以及一些本地的 python 魔术来将所有内容联系在一起 - 就这样。
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"resize": {
"use": ":original",
"robot": "/image/resize",
"format": "png",
"resize_strategy": "fillcrop",
"width": 350,
"height": 350,
"imagemagick_stack": "v2.0.7"
}
}
}
# Mask the image
# Reads the input image
img = cv2.imread(img_path)
# Creates a mask with the same size as the image
mask = np.zeros(img.shape, dtype=np.uint8)
# Creates a white circle in the centre
mask = cv2.circle(mask, (175, 175), 175, (255, 255, 255), -1)
# Makes a small whole in the centre of the mask
mask = cv2.circle(mask, (175, 175), 20, (0, 0, 0), -1)
result = cv2.bitwise_and(img, mask)
这将拍摄一张图像,并为其创建一个看起来像甜甜圈的蒙版。
然后,在图像和蒙版之间使用按位和运算,最终得到原始图像的千篇一律
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"trimmed": {
"use": ":original",
"robot": "/image/resize",
"alpha": "Activate",
"type": "TrueColor",
"transparent": "0,0,0",
"imagemagick_stack": "v2.0.7"
}
}
}
这只会使所有黑色像素透明。
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"watermark": {
"use": ":original",
"robot": "/image/resize",
"watermark_size": "33%",
"watermark_position": "center",
"imagemagick_stack": "v2.0.7"
}
}
}
{
"steps": {
":original": {
"robot": "/upload/handle"
},
"rotate_image": {
"use": ":original",
"robot": "/image/resize",
"rotation": "${file.basename}",
"resize_strategy": "crop",
"imagemagick_stack": "v2.0.7"
},
"animated": {
"robot": "/video/merge",
"use": {
"steps": [
{
"name": "rotate_image",
"as": "image"
}
],
"bundle_steps": true
},
"result": true,
"ffmpeg_stack": "v4.3.1",
"ffmpeg": {
"f": "gif",
"pix_fmt": "rgb24"
}
}
}
}
在这里,我使用图像的名称来确定将其旋转多少度 - 因此,当我将文件上传到机器人时,我将使用以下 python 代码根据其在数组中的索引来命名图像:
# Now we make a list of images that represent each frame
no_of_frames = 60
assembly = tl.new_assembly({'template_id': [SPINNING_VINYL_TEMPLATE_ID]})
directory = 'Assets/Frames/{image}'.format(image=img_name)
# Length of our animation in seconds
length = 2
for i in range(no_of_frames):
if not os.path.exists(directory):
os.mkdir(directory)
# Creates an image based on the index in the animation
# We pass this to the robot so it knows how many degrees to rotate the image by
location = '{directory}/{index}.png'.format(directory=directory, index=round(i*360/no_of_frames))
cv2.imwrite(location, finished_vinyl)
assembly.add_file(open(location, 'rb'))