GCRflow: PDF gray component replacement in your browser
GCRflow is a browser-based PDF Gray Component Replacement service that also converts TIFF files: upload a file in the converter and choose the GCR strength with ColorField 1, from GCR0 to GCR100. Rich-black boost and Low Gray Enhancement are optional. Official presets convert to GRACoL 2013 at TAC 320%; custom presets can use GRACoL 2013, FOGRA27, FOGRA39 or FOGRA51 and a total ink limit (TAC) from 260% up to the TAC limit offered for each printing condition (320% for GRACoL 2013 and FOGRA39, 340% for FOGRA27, 300% for FOGRA51). RGB with an embedded ICC profile is converted per object using that profile; untagged RGB defaults to ECI-RGB V1.0 and can be switched to sRGB, Adobe RGB or Display P3. The output is print-ready: RGB is converted to CMYK, total ink stays within the chosen limit, exact pure black text (RGB 0/0/0) stays single black and an output intent is embedded. Also through the API; a Mac client (hot folder) is in testing. Pricing: see the Pricing page.
GCRflow 是浏览器内使用的 PDF 灰色成分替换服务，也可转换 TIFF 文件：在转换器中上传文件，用 ColorField 1 在 GCR0 到 GCR100 之间选择 GCR 强度；官方预设按 GRACoL 2013、TAC 320% 转换，自定义预设可选 GRACoL 2013、FOGRA27、FOGRA39、FOGRA51 及 260% 起、不超过该印刷条件可选最高值的 TAC 上限。带嵌入 ICC 的 RGB 按嵌入配置文件逐对象转换；无标记 RGB 缺省按 ECI-RGB V1.0，可改选 sRGB / Adobe RGB / Display P3。也可通过 API 接入；Mac 客户端（热文件夹）正在测试。价格：见价格页。
The converter needs JavaScript.