如何在python或java中将geotiff转换为jpg? [英] how to convert geotiff to jpg in python or java?

问题描述

我有一个3波段的Geotiff图像.

i have a geotiff images that have 3bands.

band1,2是实际图像值，band3是实例角度值.

band1,2 is a actual image values and band3 is a instance angle value.

band1,2是float32数据类型

band1,2 is float32 data type

在代码下是我以前尝试过的.

under code is that i try before.

但是它不起作用.

我认为频段数据的范围太大，所以不会

i think band data's range is too large, so it doesn't

from osgeo import gdal, osr, ogr
from PIL import Image
import numpy as np


ds = gdal.Open('image path', gdal.GA_ReadOnly)
rb = ds.GetRasterBand(1)
test = rb.ReadAsArray()
rb2 = ds.GetRasterBand(2)
test2 = rb2.ReadAsArray()
rb3 = ds.GetRasterBand(3)
test3 = rb3.ReadAsArray()
slice56 = test2
formatted = (slice56 * 255 / np.max(slice56)).astype('uint8')
img = Image.fromarray(formatted)
img.save('save image path')

我该如何解决这个问题?

how can i solve this problem??

推荐答案

您可以为此使用gdal.Translate.

您可以在此处

from osgeo import gdal
    
options_list = [
    '-ot Byte',
    '-of JPEG',
    '-b 1',
    '-scale'
]           

options_string = " ".join(options_list)
    
gdal.Translate(
    'save_image_path.jpg',
    'image_path.tif',
    options=options_string
)

上面的代码仅创建了一个带1缩放到字节范围的jpg文件.您可以通过添加，'-b 2'等添加更多的频段.还要注意，小数位会自动将整个范围包装为字节范围.如果您还喜欢其他东西，可以使用'-scale min_val max_val'来指定所需的范围，因为通常您不需要可用的最低或最高值.

The above code simply create a jpg file with band 1 scaled into byte range. You could add more bands by adding, '-b 2' etc. Also notice that scale automatically wraps the entire range into byte range. If you like something else you could use '-scale min_val max_val' in order to specify the range you like, since often you have no need of either the lowest or highest values available.

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