使用调整图层增强PSD

概览

在本文中，我们将探讨在Aspose.PSD for Python中编辑调整图层。调整图层是图像编辑中的一个强大功能，允许您对图像进行非破坏性更改。Aspose.PSD提供了一套全面的调整图层类，您可以使用这些类修改图像的各个方面。

为了演示调整图层的编辑，我们将使用一个代码示例，在页面的末尾加载一个PSD图像并对其图层应用不同的调整。

在下面的代码示例中，我们首先使用PsdImage.load()方法加载PSD图像。然后设置保存输出PNG文件的选项。PngOptions类允许我们指定输出图像的颜色类型。

接下来，我们遍历PSD图像中的每个图层，并使用is_assignable()方法检查其类型。如果图层属于特定类型，我们使用cast()方法将其转换为该类型，并应用所需的调整。例如，我们调整BrightnessContrastLayer的亮度和对比度，修改LevelsLayer的级别，为CurvesLayer添加曲线点，等等。

您可以添加其他代码以对其各自的图层应用其他调整。Aspose.PSD提供了一系列调整图层类，例如ExposureLayer，HueSaturationLayer，ColorBalanceAdjustmentLayer，BlackWhiteAdjustmentLayer，PhotoFilterLayer，ChannelMixerLayer，InvertAdjustmentLayer，PosterizeLayer，ThresholdLayer，SelectiveColorLayer等等。

最后，我们使用PsdImage类的save()方法保存修改后的图像。

本代码提供了如何在Aspose.PSD for Python中编辑调整图层的基本概述。您可以根据自己的需求定制调整，并探索API文档中提供的各种选项。

请查看完整示例。

示例

from aspose.psd import Color
from aspose.psd.fileformats.png import PngColorType
from aspose.psd.fileformats.psd import PsdImage
from aspose.psd.fileformats.psd.layers.adjustmentlayers import BrightnessContrastLayer, LevelsLayer, CurvesLayer, \
    ExposureLayer, HueSaturationLayer, ColorBalanceAdjustmentLayer, BlackWhiteAdjustmentLayer, PhotoFilterLayer, \
    ChannelMixerLayer, RgbMixerChannel, InvertAdjustmentLayer, PosterizeLayer, ThresholdLayer, SelectiveColorLayer, \
    CmykCorrection, SelectiveColorsTypes
from aspose.psd.fileformats.psd.layers.layerresources import CurvesContinuousManager
from aspose.psd.imageoptions import PngOptions
from aspose.pycore import cast, is_assignable


def AdjustmentLayerEnhancementTest():
    sourcePsd = "AllAdjustments.psd"
    outputOrigPng = "AllAdjustments_orig.png"
    outputModPng = "AllAdjustments_mod.png"
    pngOpt = PngOptions()
    pngOpt.color_type = PngColorType.TRUECOLOR_WITH_ALPHA

    with PsdImage.load(sourcePsd) as image:
        psdImage = cast(PsdImage, image)
        psdImage.save(outputOrigPng, pngOpt)
        layers = psdImage.layers

        for layer in layers:
            if is_assignable(layer, BrightnessContrastLayer):
                br = cast(BrightnessContrastLayer, layer)
                br.brightness = -br.brightness
                br.contrast = -br.contrast

            if is_assignable(layer, LevelsLayer):
                levels = cast(LevelsLayer, layer)
                levels.master_channel.output_shadow_level = 30
                levels.master_channel.input_shadow_level = 5
                levels.master_channel.input_midtone_level = 2
                levels.master_channel.output_highlight_level = 213
                levels.master_channel.input_highlight_level = 120

            if is_assignable(layer, CurvesLayer):
                curves = cast(CurvesLayer, layer)
                manager = curves.get_curves_manager()
                curveManager = cast(CurvesContinuousManager, manager)
                curveManager.add_curve_point(2, 150, 180)

            if is_assignable(layer, ExposureLayer):
                exp = cast(ExposureLayer, layer)
                exp.exposure = exp.exposure + 0.1

            if is_assignable(layer, HueSaturationLayer):
                hue = cast(HueSaturationLayer, layer)
                hue.hue = -15
                hue.saturation = 30

            if is_assignable(layer, ColorBalanceAdjustmentLayer):
                colorBal = cast(ColorBalanceAdjustmentLayer, layer)
                colorBal.midtones_cyan_red_balance = 30

            if is_assignable(layer, BlackWhiteAdjustmentLayer):
                bw = cast(BlackWhiteAdjustmentLayer, layer)
                bw.reds = 30
                bw.greens = 25
                bw.blues = 40

            if is_assignable(layer, PhotoFilterLayer):
                photoFilter = cast(PhotoFilterLayer, layer)
                photoFilter.color = Color.azure

            if is_assignable(layer, ChannelMixerLayer):
                channelMixer = cast(ChannelMixerLayer, layer)
                channel = channelMixer.get_channel_by_index(0)
                if is_assignable(channel, RgbMixerChannel):
                    rgbChannel = cast(RgbMixerChannel, channel)
                    rgbChannel.green = 120
                    rgbChannel.red = 50
                    rgbChannel.blue = 70
                    rgbChannel.constant += 10

            if is_assignable(layer, InvertAdjustmentLayer):
                # Here is nothing to do ¯\_(ツ)_/¯ If this layer is presented than all colors will be inverted under it.
                # Also, you can add it to the new image
                # img = PsdImage(100, 100)
                # img.AddInvertAdjustmentLayer()
                pass

            if is_assignable(layer, PosterizeLayer):
                post = cast(PosterizeLayer, layer)
                post.levels = 3

            if is_assignable(layer, ThresholdLayer):
                threshold = cast(ThresholdLayer, layer)
                threshold.level = 15

            if is_assignable(layer, SelectiveColorLayer):
                selectiveColor = cast(SelectiveColorLayer, layer)
                correction = CmykCorrection()
                correction.cyan = 25
                correction.magenta = 10
                correction.yellow = -15
                correction.black = 5
                selectiveColor.set_cmyk_correction(SelectiveColorsTypes.CYANS, correction)

        psdImage.save(outputModPng, pngOpt)