Watermark opacity should be 100%

[tony2guo]

In 博碩士論文上傳說明 page 17 and Thesis/Dissertation Format Reference page 17 have their watermark opacity set to 100%.
I think the nthu-logo.pdf has already lightened the color, so we may not need to set the opacity. We could revert commit bf45eb1.

But I am not sure about "Scale relative to target page: 50%" in those docs, setting scale=0.5 in draftwatermark makes the watermark too small.

[KuanYuChang]

Hi @tony2guo,

Thanks for the feedback. This configuration is decided by "what I think looks better." Note that without reducing its opacity, the watermark may be indistinguishable from the foreground text and thus impede reading. That's why I set it to 0.5. As for the watermark size, do you think it is better to make it larger?

opacity=1	opacity=0.5

Regards,
Kuan-Yu

[KuanYuChang]

The option "Scale Relative To Target Page" is to resize the watermark in relation to the PDF page dimensions. Thus, I rescale the watermark by setting its width to 50% paper width.

[tony2guo]

I agree opacity=0.5 does look better. But since the official document wants opacity=1, I suggest setting opacity=1 as default. Maybe replace the nowatermark option with watermark_opacity, which 0 is no watermark.

[KuanYuChang]

Hi @tony2guo,

We gained the app Adobe Acrobat and tried out the setting from 博碩士論文上傳說明 [1]. It turns out that setting the opacity to 100% makes no difference from the document built from LaTeX and will indeed impede reading. However, after an inner struggle, we decided to follow the setting in [1] and left the customization effort to the user who thinks opacity 1 is terrible.

Sincerely,
Kuan-Yu

Reference
[1] https://www.lib.nthu.edu.tw/ETD/downloads/upload.pdf

[tony2guo]

Thanks for the experiment!